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BTW, the source code for this is fairly straightforward. I just added the source into the sample for now, but it would be nicer if we had the function.

From source:

 /**
 * Gets the current navigation back stack entry as a [MutableState]. When the given navController
 * changes the back stack due to a [NavController.navigate] or [NavController.popBackStack] this
 * will trigger a recompose and return the top entry on the back stack.
 *
 * @return a mutable state of the current back stack entry
 */
@Composable
public fun NavController.currentBackStackEntryAsState(): State<NavBackStackEntry?> {
    return currentBackStackEntryFlow.collectAsState(null)
}

Here's the code from my PR if you want to see what I was doing.