exportDropCapMod function
Implementation
String? exportDropCapMod(DropCapMode? mode) {
  if (mode == null) {
    return null;
  }
  switch (mode) {
    case DropCapMode.inside:
      return "inside";
    case DropCapMode.baseline:
      return "baseline";
    case DropCapMode.aside:
      return "aside";
    case DropCapMode.upwards:
      return "upwards";
    default:
      return "inside";
  }
}