demo.kt

composable(
    route = UserPageDestination.route + ",list={list}",
    arguments = UserPageDestination.argumentList.apply {
        add(navArgument("list") {
            type = // your type here
        })
    }
) { backStackEntry ->
    val (userId, isLoggedIn) = UserPageDestination.parseArguments(backStackEntry)
    val list = backStackEntry.arguments?.getParcelableArrayList("list")
    // content
}