Wish Save data in a local database using Room

I am aware that SQLite can be used, but as Google recommends it would be nice to have this tool in B4A.

https://developer.android.com/training/data-storage/room/

You can use ExternalLogger Library if you want (you can store just Strings as the library is not a real wrapper for the hole Idea. It is an Logger which can be used inside an B4A app to store and read LOGs.
As you can mark each Logentry using a Tag (String too). You also could use it to store Data based on a specific Tag.
And then read them back by Tag, date.

ExternalLogger