minecraft-bedrock-json-schemas/source/resource/ui/elements/properties/renderer.json

{
  "title": "Renderer",
  "description": "The renderer that will be used by the element.",
  "anyOf": [
    {
      "enum": ["ui_holo_cursor"]
    },
    {
      "$ref": "../../general/item_ref.json"
    }
  ]
}