[
    {
        "id": "SF_1_1",
        "title": "SF_1_1",
        "$formkit": "group",
        "children": [
            [
                {
                    "id": "location",
                    "title": "Location",
                    "$formkit": "group",
                    "children": [
                        {
                            "$formkit": "number",
                            "id": "foo",
                            "name": "foo"
                        }
                    ]
                }
            ]
        ]
    }
]