[
 {
  "op": "test",
  "path": "/properties/CustomJson",
  "value": {
   "type": "object"
  }
 },
 {
  "op": "replace",
  "path": "/properties/CustomJson",
  "value": {
   "format": "json",
   "type": [
    "object",
    "string"
   ]
  }
 }
]
