what would be the equivalent of "onResume" for a "screen" when using the navigation component ? A LaunchedEffect? . I wanna reset the scroll every time user returns to the screen

Yes, You can do it in

LaunchedEffect

passing

key1 = Unit

. Whenever you returns to the screen it will execute whatever you put in it.

Depends whether you actually want the exact behaviour. Those are not exactly the same.