The retrieval component needs to support returning JSON data(#10170) (#10171)

### What problem does this PR solve?

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/data-flow/constant.tsx

@@ -133,6 +133,10 @@ export const initialRetrievalValues = {
       type: 'string',
       value: '',
     },
+    json: {
+      type: 'Array<Object>',
+      value: [],
+    },
   },
 };
 

web/src/pages/data-flow/form/retrieval-form/next.tsx

@@ -83,6 +83,10 @@ function RetrievalForm({ node }: INextOperatorForm) {
         title: 'formalized_content',
         type: initialRetrievalValues.outputs.formalized_content.type,
       },
+      {
+        title: 'json',
+        type: initialRetrievalValues.outputs.json.type,
+      },
     ];
   }, []);