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

{
  "title": "Variables",
  "description": "The variables that are contained within this element.",
  "definitions": {
    "variables": {
      "title": "Variable Definition",
      "description": "A variable is a reference to a value that can be used in the UI."
    }
  },
  "anyOf": [
    { "$ref": "../../general/item_ref.json" },
    {
      "type": "array",
      "items": {
        "type": "object",
        "title": "Variables",
        "additionalProperties": { "$ref": "#/definitions/variables" }
      }
    },
    {
      "type": "object",
      "title": "Variables",
      "additionalProperties": { "$ref": "#/definitions/variables" }
    }
  ]
}