Expo firebase firebase cloud messaging. Eject ?

I Followed expo documentation for using Firebase ( JS SDK ). ( DOCS ) I am importing Firebase as below.

import * as firebase from 'firebase';

I want to use Firebase cloud messaging. Is this possible with above.
and Is it possible to receive notification on android/ IOS for messaging. ( With out storing my expo notification token, Then using it send notification from back end code.)

Should i eject my app and use native firbase ( @react-native-firebase/app )

Any help would be much appreciated.

PS: I am new to Firebase/ React native.