I'M about to create an android app using kotlin+jetpack compose It

Question

I'M about to create an android app using kotlin+jetpack compose It

would be helpful if someone can clarify the following points:

- i will need to fetch data from a remote database. Can I connect the android app directly to this remote db via the db driver (mongodb driver for instance) or will I need to call a separate backend layer to fetch data from this remote db?

- is it possible to create another separate android application that behaves like a backend server, running in a background process like a daemon and my "frontend" Android app would call this service to fetch data?

Thankyou for your time