setExtraItems method
Sets your own extra items to display within menu.
Implementation
Future<void> setExtraItems(
{required JVDisplayMenu menu,
required List<String> captions,
required Function callback}) async {
_extraItemsCallback = callback;
await _channel.invokeMethod<void>('display:setExtraItems',
{'menu': menu.toString().split('.').last, 'captions': captions});
}