CategoryField

{
  "type": "category",
  "field_id": "genre",
  "title": "Select all genres that apply.",
  "choices": [
    {
      "label": "Hip-Hop/Rap",
      "value": "hip-hop-rap",
      "hint":
        "It consists of a stylized rhythmic music that commonly accompanies rapping, a rhythmic and rhyming speech that is chanted.",
      "subchoices": [
        { "label": "Dirty South", "value": "dirty-south" },
        { "label": "Industrial Hip Hop", "value": "industrial-hip-hop" },
        { "label": "Nerdcore", "value": "nerdcore" },
        { "label": "Rap", "value": "rap" },
      ]
    },
        {
      "label": "R&B/Soul",
      "value": "rb-soul",
      "subchoices": [
        { "label": "Disco", "value": "disco" },
        { "label": "Funk", "value": "funk" },
        { "label": "Motown", "value": "motown" },
      ]
        },
  ],
  "min_choices": 1,
  "max_choices": 5
}