Hi,

You were almost there.

You need to add an additional response, i.e the userdata response to the output. You can copy this code below

"output": {
   "width": 512,
   "height": 512,
   "responses": [
       {
           "identifier": "default",
           "format": {
               "type": "image/jpeg",
               "quality": 80
           }
       },
       {
        "identifier": "userdata",
        "format": {
          "type": "application/json"
        }
      }
   ]
},

Let us know if that solves the error