Feat: The query variables of the subsequent operators can reference the structured variables defined in the agent operator. #10866 (#10902)

### What problem does this PR solve?

Feat: The query variables of the subsequent operators can reference the
structured variables defined in the agent operator. #10866

### Type of change


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

web/src/pages/agent/constant/index.tsx

@@ -617,7 +617,10 @@ export const initialAgentValues = {
       type: 'string',
       value: '',
     },
-    [AgentStructuredOutputField]: {},
+    [AgentStructuredOutputField]: {
+      type: 'Object Array String Number Boolean',
+      value: '',
+    },
   },
 };