How to push notification with firebase FCM to all users of my App with Ionic ?!

I need to notify all users with news , i did only notification method with token of user but notification shown only on the device of this user , i need to notify all users
any help please ?

Pushing to large groups in Firebase is done on the server using firebase functions or groups so you can use the UI

This a.o. requires you to capture the tokens of individual devices on the server

At least, when I read the docs on Firebase messaging this is what I read