diff --git a/frigate/cli.py b/frigate/cli.py
index 274d814..c1aac59 100644
--- a/frigate/cli.py
+++ b/frigate/cli.py
@@ -24,7 +24,10 @@ def cli():
 @click.option(
     "--no-deps", is_flag=True, default=True, help="Do not render dependency values",
 )
-def gen(filename, output_format, no_credits, no_deps):
+@click.option(
+    "--no-update", is_flag=True, default=True, help="Do not update the charts",
+)
+def gen(filename, output_format, no_credits, no_deps, no_update):
     click.echo(
-        frigate.gen.gen(filename, output_format, credits=no_credits, deps=no_deps)
+        frigate.gen.gen(filename, output_format, credits=no_credits, deps=no_deps, update=no_update)
     )
diff --git a/frigate/gen.py b/frigate/gen.py
index 8621645..4221b0a 100644
--- a/frigate/gen.py
+++ b/frigate/gen.py
@@ -3,7 +3,8 @@
 import tempfile
 import shutil
 import subprocess
-
+import datetime
+from json import JSONEncoder
 from jinja2 import Environment, FileSystemLoader
 from ruamel.yaml import YAML
 from ruamel.yaml.comments import CommentedMap
@@ -36,6 +37,36 @@ def load_chart(chartdir, root=None):
     return chart, list(traverse(values, root=root))
 
 
+def load_prepacked_chart_with_dependencies(chartdir, root=None):
+    root = [] if root is None else root
+    chart, values = load_chart(chartdir, root=root)
+    if "dependencies" in chart:
+        for dependency in chart["dependencies"]:
+            dependency_name = dependency["name"]
+
+            with tempfile.TemporaryDirectory() as tmpdirname:
+                tar_file_path = os.path.join(
+                    chartdir, "charts", f"{dependency_name}-{dependency['version']}.tgz",
+                )
+                if os.path.isfile(tar_file_path):
+                    dependency_path = tar_file_path
+                    shutil.unpack_archive(dependency_path, tmpdirname)
+                    dependency_dir = os.path.join(tmpdirname, dependency_name)
+                else:
+                    dependency_path = os.path.join(
+                        chartdir, "charts", f"{dependency_name}",
+                    )
+                    dependency_dir = os.path.join(chartdir, dependency_path)
+                # chart namespace eg nginx.controller.foo
+                namespace = root + [dependency_name]
+
+                _, dependency_values = load_prepacked_chart_with_dependencies(
+                    dependency_dir, namespace
+                )
+                values = squash_duplicate_values(values + dependency_values)
+    return chart, values
+
+
 def load_chart_with_dependencies(chartdir, root=None):
     """Load the yaml information from a Helm chart directory and its dependencies.
 
@@ -184,6 +215,12 @@ def clean_comment(comment):
     return comment.strip("# ")
 
 
+class DateTimeEncoder(JSONEncoder):
+    def default(self, obj):
+        if isinstance(obj, (datetime.date, datetime.datetime)):
+            return obj.isoformat()
+
+
 def traverse(tree, root=None):
     """Iterate over a tree of configuration and extract all information.
 
@@ -230,10 +267,10 @@ def traverse(tree, root=None):
             if key in tree.ca.items:
                 comment = get_comment(tree, key)
             param = ".".join(root + [key])
-            yield [param, comment, json.dumps(default)]
+            yield [param, comment, json.dumps(default, indent=4, sort_keys=True, cls=DateTimeEncoder)]
 
 
-def gen(chartdir, output_format, credits=True, deps=True):
+def gen(chartdir, output_format, credits=True, deps=True, update=True):
     """Generate documentation for a Helm chart.
 
     Generate documentation for a Helm chart given the path to a chart and a
@@ -244,14 +281,19 @@ def gen(chartdir, output_format, credits=True, deps=True):
         output_format (str): Output format (maps to jinja templates in frigate)
         credits (bool): Show Frigate credits in documentation
         deps (bool): Read values from chart dependencies and include them in the config table
+        update (bool): If false, frigate won't update the charts at runtime
 
     Returns:
         str: Rendered documentation for the Helm chart
 
     """
-    chart, values = (
-        load_chart_with_dependencies(chartdir) if deps else load_chart(chartdir)
-    )
+    if deps:
+        if update:
+            chart, values = load_chart_with_dependencies(chartdir)
+        else:
+            chart, values = load_prepacked_chart_with_dependencies(chartdir)
+    else:
+        chart, values = load_chart(chartdir)
 
     templates = Environment(loader=FileSystemLoader([chartdir, TEMPLATES_PATH]))
     if os.path.isfile(os.path.join(chartdir, DOTFILE_NAME)):
diff --git a/frigate/templates/html.jinja2 b/frigate/templates/html.jinja2
index 2a20588..15c11e1 100644
--- a/frigate/templates/html.jinja2
+++ b/frigate/templates/html.jinja2
@@ -44,7 +44,7 @@
   <tr>
     <td><code>{{ param }}</code></td>
     <td>{{ comment }}</td>
-    <td><code>{{ default }}</code></td>
+    <td><pre>{{ default }}</pre></td>
   </tr>
   {% endfor -%}
 </table>
diff --git a/frigate/templates/markdown.jinja2 b/frigate/templates/markdown.jinja2
index ec4f35c..a5cee24 100644
--- a/frigate/templates/markdown.jinja2
+++ b/frigate/templates/markdown.jinja2
@@ -15,14 +15,37 @@
 ## Configuration
 
 The following table lists the configurable parameters of the {{ name | capitalize }} chart and their default values.
-
-| Parameter                | Description             | Default        |
-| ------------------------ | ----------------------- | -------------- |
+<table>
+<thead>
+<tr>
+<th>Parameter</th>
+<th>Description</th>
+<th>Default</th>
+</tr>
+</thead>
+<tbody>
 {% for (param, comment, default) in values -%}
-| `{{ param }}` | {{ comment }} | `{{ default }}` |
+<tr>
+<td>{{ param }}</td>
+<td>{{ comment }}</td>
+<td>
+{% if "\n" in default %}
+
+```json
+
+{{ default }}
+
+```
+
+{% else %}
+{{ default }}
+{% endif %}
+</td>
+</tr>
 {% endfor -%}
+</tbody>
+</table>
 {%- endblock %}
-
 {% block footnotes -%}
 {{ footnotes }}
 {% endblock -%}
@@ -32,4 +55,4 @@ The following table lists the configurable parameters of the {{ name | capitaliz
 ---
 _Documentation generated by [Frigate](https://frigate.readthedocs.io)._
 {%- endif -%}
-{%- endblock %}
\ No newline at end of file
+{%- endblock %}
diff --git a/frigate/tests/test_frigate.py b/frigate/tests/test_frigate.py
index 7d1c572..9b3f641 100644
--- a/frigate/tests/test_frigate.py
+++ b/frigate/tests/test_frigate.py
@@ -150,9 +150,8 @@ def test_deps(deps_chart_path):
 
     docs = gen(deps_chart_path, "markdown")
 
-    assert "simple.image.repository" in docs
-    [tag_line] = [line for line in docs.splitlines() if "simple.image.tag" in line]
-    assert "mainline" in tag_line
+    assert "<td>simple.image.repository</td>" in docs
+    assert "<td>\n\n\"mainline\"\n\n</td>" in docs
 
 
 def test_squash_duplicates():
@@ -162,3 +161,11 @@ def test_squash_duplicates():
 
     assert len(values) == 1
     assert values[0][2] == "world"
+
+
+def test_load_pre_packaged_chart(deps_chart_path):
+    from frigate.gen import gen
+
+    docs = gen(deps_chart_path, "markdown", update=False)
+    assert "image.repository" in docs
+    assert "<td>\n\n\"nginx\"\n\n</td>" in docs