diff --git a/aligned/retrival_job.py b/aligned/retrival_job.py
index 9d0f603..9dc876a 100644
--- a/aligned/retrival_job.py
+++ b/aligned/retrival_job.py
@@ -1694,6 +1694,8 @@ async def to_pandas(self) -> pd.DataFrame:
                         df[feature.name] = df[feature.name].apply(
                             lambda x: json.loads(x) if isinstance(x, str) else x
                         )
+                elif feature.dtype == FeatureType.json():
+                    pass
                 else:
                     if feature.dtype.is_numeric:
                         df[feature.name] = pd.to_numeric(df[feature.name], errors='coerce').astype(
@@ -1740,6 +1742,8 @@ async def to_polars(self) -> pl.LazyFrame:
                     dtype = df.select(feature.name).dtypes[0]
                     if dtype == pl.Utf8:
                         df = df.with_columns(pl.col(feature.name).str.json_extract(pl.List(pl.Utf8)))
+                elif feature.dtype == FeatureType.json():
+                    pass
                 else:
                     df = df.with_columns(pl.col(feature.name).cast(feature.dtype.polars_type, strict=False))
 
diff --git a/aligned/schemas/transformation.py b/aligned/schemas/transformation.py
index dc16be7..97d4187 100644
--- a/aligned/schemas/transformation.py
+++ b/aligned/schemas/transformation.py
@@ -2141,10 +2141,17 @@ class StructField(Transformation):
     dtype = FeatureType.string()
 
     async def transform_pandas(self, df: pd.DataFrame) -> pd.Series:
-        return df[self.key].apply(lambda x: x[self.field])
+        return (
+            (await self.transform_polars(pl.from_pandas(df).lazy(), 'feature'))
+            .collect()
+            .to_pandas()['feature']
+        )
 
     async def transform_polars(self, df: pl.LazyFrame, alias: str) -> pl.LazyFrame | pl.Expr:
-        return pl.col(self.key).struct.field(self.field).alias(alias)
+        if df.schema[self.key].is_(pl.Utf8):
+            return await JsonPath(self.key, self.field).transform_polars(df, alias)
+        else:
+            return pl.col(self.key).struct.field(self.field).alias(alias)
 
 
 @dataclass
diff --git a/pyproject.toml b/pyproject.toml
index b8caf0e..99a4e6b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aligned"
-version = "0.0.58"
+version = "0.0.59"
 description = "A data managment and lineage tool for ML applications."
 authors = ["Mats E. Mollestad <mats@mollestad.no>"]
 license = "Apache-2.0"