How to implement a custom sound for the @capacitor/push-notifications?

Capacitor
1

Hello everyone!
I’m using @ionic/vue (7.0.0), @capacitor/cli (5.0.5), @capacitor/push-notifications (5.1.0)

  1. I’ve created a channel:
PushNotifications.createChannel({
        id: "fcm_default_channel",
        name: "My notification channel",
        sound: "bark.wav",
        importance: 5,
        visibility: 1
      })
        .then(() => {
          alert("push channel created: ");
        })
        .catch((error) => {
          alert("push channel error: " + error);
        });
  1. Added my bark.wav into app/src/main/res/raw folder
  2. Send message using firebase-admin/messaging:
const notification = {
  title: "Hey there!",
  body: "Hello from Canada!",
}

const message = {
  notification,
  android: {
    notification: {
      ...notification,
      channelId: 'fcm_default_channel',
      sound: 'bark.wav',
    }
  },
  token,
};

getMessaging()
  .send(message)
  .then((response) => {
    console.log("Successfully sent message: ", response);
  })
  .catch((error) => {
    console.log("Error sending message: ", error);
  });

But it doesn’t work. I don’t hear bark.wav or default sound. Sound is absolutely absent.

I would be grateful for any assistance,
Best regards!