JSON validation: read-only sub-fields, translation code

// Item
{
  "status": {
    "description": "The status of the item",
    "type": "object",
    "properties": {
      "name": {
        "description": "Name of the status e.g. Available, Checked out, In transit",
        "type": "string"
      },
      "date": { // <-- date here is readonly.
        "description": "Date and time when the status was last changed",
        "type": "string",
        "format": "date-time",
        "readonly": true
      }
    },
    "additionalProperties": false
  }
}

((JsonObject)content).remove(cv.getPropertyPath().toString());