What's the JSONPath to correctly parse this NWCToolkit response?

I have an API (NWCToolkit Xtension,  base64encodefile) that returns two JSON elements: “error” and “result”:

    "Result": {
      "description": "Model for Result",
      "required": [
        "error"
      ],
      "properties": {
        "error": {
          "type": "string",
          "x-example": ""
        },
        "result": {
          "type": "string",
          "x-example": "SGV5IHdoYXRzIGdvaW5nIG9u"
        }
      }
    },

Since the workflow designer GUI doesn’t seem to have any way to differentiate “error” and “result”, I’m using the Query JSON action to parse the results.  Query JSON uses a JSONPath expression, and returns a Collection.

Q: What JSONPath expression do I need to return a Collection with two elements: “error” and “results”?