@minecraft/creator-tools/data/forms/resource/render_controller_set_materials.form.json

Minecraft Creator Tools command line and libraries.

{
  "title": "Render Controller Set",
  "fields": [
    {
      "id": "render_controllers",
      "displayTitle": false,
      "allowCreateDelete": false,
      "dataType": 14,
      "subForm": {
        "fields": [
          {
            "id": "materials",
            "title": "Materials",
            "description": "A name or expression that expresses logic for which material to use to display this particular entity",
            "dataType": 29
          },
          {
            "id": "arrays",
            "title": "Lists",
            "dataType": 16,
            "subForm": {
              "fields": [
                {
                  "id": "materials",
                  "title": "Materials",
                  "undefinedIfEmpty": true,
                  "description": "Lists of materials that can be used in selection calculations",
                  "dataType": 28
                }
              ]
            }
          }
        ]
      }
    }
  ]
}