Hi Miguel,
1. I have not used buddyboss, I will let you know after seeing that plugin buddyboss.
2. This is WordPress plugin for push notification PWA plugin to be used with WordPress BuddyPress for website in desktop, or mobile browser. If you need it for android app then it requires separate native code based on android app design, if android app design is using react native then this plugin cannot be used but integration of firebase logic will be same it needs to written under react native or reactjs. Or if android app is based on Kotlin/Java then it requires new code to be developed in same language.
I have created 2 react native apps based on these function but this code is totally on react native platform using AWS dynamodb and AWS amplify but structure similar to WordPress BuddyPress. (I migrated from WordPress to react native platform using aws technologies). This app is in play store,
https://play.google.com/store/apps/details?id=com.indiacities.indiacitiesforum
Another app in play store
https://play.google.com/store/apps/details?id=com.indiacities.chennaicommunityforum