BottomSheetScaffoldWithFloating.kt

val bottomSheetState = rememberStandardBottomSheetState()
val scaffoldState = rememberBottomSheetScaffoldState(bottomSheetState)

BottomSheetScaffold(
    modifier = Modifier.fillMaxSize(),
    scaffoldState = scaffoldState,
    sheetContainerColor = Color.Transparent,
    sheetContent = {
        // Put whatever the sheet you want in here
    }
) { innerPadding ->
    Box(
        modifier = Modifier
            .fillMaxSize()
            .padding(innerPadding)
    ) {
        var composableHeight by remember { mutableStateOf(0) } // the height I mentioned

        Box(
            modifier = Modifier
                .fillMaxWidth()
                // `.padding(16.dp)` is messing with the `.offset`. Use it after the `.offset` call
                .onSizeChanged { composableHeight = it.height } // Dear Modifier, thanks for having such a good function
                .offset {
                    IntOffset(
                        x = 0,
                        y = bottomSheetState.requireOffset().roundToInt() - composableHeight, // these values represent pixels
                    )
                }
                .padding(16.dp)
        ) {
            FloatingActionButton(
                modifier = Modifier.align(Alignment.CenterEnd),
                onClick = { /*TODO*/ }
            ) {
                Image(
                    painter = painterResource(id = R.drawable.ic_launcher_foreground),
                    contentDescription = null
                )
            }
        }
    }
}