{
  "schema": {
    "options": {
      "name": "options",
      "properties": {
        "options.username": {
          "name": "options.username",
          "type": "string",
          "title": "Username description frozen"
        }
      },
      "type": "object",
      "title": "Common configuration"
    }
  },
  "model": [
    {
      "key": "options.username",
      "readOnly": true
    }
  ],
  "form": [
    {
      "key": "options.username",
      "pattern": "^[a-z_][a-z0-9_-]{0,30}[$a-z0-9_-]{0,1}$",
      "type": "input"
    },
    {
      "title": "Configurer",
      "type": "submit"
    }
  ]
}