How to use the @ionic-native/google-maps.GoogleMapsAnimation.DROP function in @ionic-native/google-maps

addMarker(marker: IonMarker) {
    const { lat, lng, iconUrl, title,
      animated, draggable, visible,
      zIndex } = marker;
    const markerOptions: MarkerOptions = {
      position: new LatLng(lat, lng),
      title,
      icon: iconUrl,
      animation: animated ? GoogleMapsAnimation.DROP : null,
      zIndex,
      draggable,
      visible
    };

    return this.map.addMarker(markerOptions);
  }
}