decode json (#3298)

* decode json

* openapi

Author: lhoestq

docs/source/openapi.json

@@ -372,6 +372,9 @@
           {
             "$ref": "#/components/schemas/TranslationVariableLanguagesFeature"
           },
+          {
+            "$ref": "#/components/schemas/JsonFeature"
+          },
           {
             "$ref": "#/components/schemas/SequenceFeature"
           },
@@ -510,6 +513,19 @@
           }
         }
       },
+      "JsonFeature": {
+        "type": "object",
+        "required": ["_type"],
+        "properties": {
+          "_type": {
+            "type": "string",
+            "enum": ["Json"]
+          },
+          "decode": {
+            "type": "boolean"
+          }
+        }
+      },
       "SequenceFeature": {
         "type": "object",
         "required": ["_type", "feature"],
@@ -669,6 +685,9 @@
           {
             "$ref": "#/components/schemas/TranslationVariableLanguagesCell"
           },
+          {
+            "$ref": "#/components/schemas/JsonCell"
+          },
           {
             "$ref": "#/components/schemas/SequenceCell"
           },
@@ -766,6 +785,19 @@
           }
         }
       },
+      "JsonCell": {
+        "oneOf": [
+          {
+            "$ref": "#/components/schemas/ValueCell"
+          },
+          {
+            "$ref": "#/components/schemas/ListCell"
+          },
+          {
+            "$ref": "#/components/schemas/DictCell"
+          }
+        ]
+      },
       "SequenceCell": {
         "oneOf": [
           {

libs/libcommon/src/libcommon/viewer_utils/features.py

@@ -445,6 +445,8 @@ def get_cell_value(
             storage_client=storage_client,
             json_path=json_path,
         )
+    elif isinstance(fieldType, Json):
+        return fieldType.decode_example(cell) if fieldType.decode else cell
     elif isinstance(fieldType, list):
         if not isinstance(cell, list):
             raise TypeError("list cell must be a list.")
@@ -535,7 +537,6 @@ def get_cell_value(
             Array5D,
             Translation,
             TranslationVariableLanguages,
-            Json,
         ),
     ):
         return cell