diff --git a/middleware/flow/src/dto/flow_var_dto.rs b/middleware/flow/src/dto/flow_var_dto.rs
index 040c9adb3..7d4f5cd33 100644
--- a/middleware/flow/src/dto/flow_var_dto.rs
+++ b/middleware/flow/src/dto/flow_var_dto.rs
@@ -48,6 +48,7 @@ pub struct FlowVarInfo {
 pub struct DefaultValue {
     pub value_type: DefaultValueType,
     pub value: Value,
+    pub ext: Value,
 }
 
 #[derive(Display, Clone, Debug, PartialEq, Eq, Deserialize, Serialize, poem_openapi::Enum, strum::EnumString)]