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

{
  "title": "Text Labels",
  "description": "The labels of the text.",
  "anyOf": [
    {
      "type": "array",
      "items": {
        "type": "string",
        "title": "Text Label"
      }
    },
    {
      "$ref": "../../general/item_ref.json"
    }
  ]
}