Flutter:谷歌地图。如何同时传递这两种标记类型？

dependencies:
  google_maps_flutter: ^2.0.10

import 'package:google_maps_flutter/google_maps_flutter.dart';

GoogleMap(
  initialCameraPosition: CameraPosition(
    target: LatLng(37.7749, -122.4194), // 设置地图初始位置
    zoom: 12.0, // 设置地图缩放级别
  ),
  markers: {
    Marker(
      markerId: MarkerId('marker1'),
      position: LatLng(37.7749, -122.4194), // 设置标记位置
      infoWindow: InfoWindow(
        title: 'Marker 1',
        snippet: 'This is marker 1',
      ),
      icon: BitmapDescriptor.defaultMarker, // 设置标记图标
    ),
    Marker(
      markerId: MarkerId('marker2'),
      position: LatLng(37.7749, -122.4294),
      infoWindow: InfoWindow(
        title: 'Marker 2',
        snippet: 'This is marker 2',
      ),
      icon: BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueBlue),
    ),
  },
)