builder.json

{
  "formfields": [
    {
      "fieldname": "ModalTitle",
      "title": "Modal Title (required)",
      "fieldtype": "text",
      "advanced": true,
      "required": true,
      "hidden": false,
      "multilanguage": false,
      "index": false,
      "position": "1col1",
      "dependencies": []
    },
    {
      "fieldname": "Items",
      "fieldtype": "array",
      "subfields": [
        {
          "fieldname": "Item",
          "title": "Item Title  (required)",
          "fieldtype": "text",
          "advanced": true,
          "required": true,
          "hidden": false,
          "multilanguage": false,
          "index": false,
          "position": "1col1",
          "dependencies": []
        },
        {
          "fieldname": "DataType",
          "title": "DataType",
          "fieldtype": "select",
          "fieldoptions": [
            {
              "value": "text",
              "text": "text"
            },
            {
              "value": "email",
              "text": "email"
            },
            {
              "value": "url",
              "text": "url"
            },
            {
              "value": "textarea",
              "text": "textarea"
            }
          ],
          "advanced": true,
          "required": true,
          "hidden": false,
          "index": false,
          "position": "1col1",
          "dependencies": []
        }
      ],
      "advanced": false
    }
  ],
  "formtype": "object"
}