defineColor method
Customizes colors for some elements.
Implementation
Future<void> defineColor(Color color, {required JVDisplayElement element}) async {
  await _channel.invokeMethod('display:defineColor', {
      'element': element.toString().split('.').last,
      'red': color.red,
      'green': color.green,
      'blue': color.blue,
      'alpha': color.alpha
  });
}