{
  "$schema": "https://json-schema.org/draft/2019-09/schema",
  "title": "test",
  "description": "asdasdint",
  "type": "object",
  "properties": {
    "fields": {
      "type": "object",
      "propertyNames": {
        "pattern": "^[a-zA-Z]+$",
        "maxLength": 5,
        "minLength": 3
      },
      "additionalProperties": {
        "type": "object",
        "properties": {
          "action": {
            "type": "string"
          }
        },
        "additionalProperties": false,
        "required": [
          "action"
        ]
      }
    }
  }
}