{
  "type": "object",
  "name": "Field4",
  "properties": {
    "name": {
      "type": "string"
    },
    "type": {
      "type": "object"
    },
    "doc": {
      "type": "string"
    },
    "default": {
      "type": "['string', 'null']"
    }
  },
  "required": [
    "name",
    "type",
    "doc"
  ],
  "$schema": "https://json-structure.org/draft/2020-12/schema"
}