HarmonyOS Notification怎么自定义通知声音？

//自定义声音不好使  
static async publish() {
  await notificationManager.addSlot(notificationManager.SlotType.SOCIAL_COMMUNICATION)
  let notificationSlot: notificationManager.NotificationSlot =
    await notificationManager.getSlot(notificationManager.SlotType.SOCIAL_COMMUNICATION)
  let soundPath = 'file://com.example.helloapplication/data/storage/el2/base/haps/entry/files/im_message_sound.mp3'
  notificationSlot.sound = soundPath
  //默认sound file://system/etc/Light.ogg
  // 通知Request对象
  let notificationRequest: notificationManager.NotificationRequest = {
    id: 1,
    notificationSlotType: notificationManager.SlotType.SOCIAL_COMMUNICATION,
    content: {
      notificationContentType: notificationManager.ContentType.NOTIFICATION_CONTENT_BASIC_TEXT,
      normal: {
        title: "test_title",
        text: "test_text",
        additionalText: "test_additionalText"
      }
    }
  };
  notificationManager.publish(notificationRequest).then(() => {
    console.info("publish success");
  }).catch((err: object) => {
    console.error(`publish fail: ${JSON.stringify(err)}`);
  });
}