Nested graphs without root destination

Is it possible to create a NavGraph without a root destination like below?

NavHost(
    navController = navController,
    startDestination = "tab_home"
) {
    navigation(
        route = "tab_home",
        startDestination = "start",
    ) {
        composable("start") { /* */ }
        composable("next") { /* */ }
    }
    navigation(
        route = "tab_setting",
        startDestination = "setting"
    ) {
        composable("setting") { /* */ }
    }
}

I added navGraph option to all @Destination but the NavGaphs with Exception was generated.

object NavGraphs {
    val tabHome = NavGraph(/* */)
    val tabSettings = NavGraph(/* */)
    val root: NavGraph = throw RuntimeException("No found destinations for 'root' navigation graph")
}

Is there any solution?

I use version 1.1.5-beta.

[STAR-ZERO]

Thank you for dealing with it so quickly. 😃

[STAR-ZERO]

Thank you for helping.

I tried to create NavGraphs manually, but I didn’t know what to set for root’s startDestination.

object NavGraphs {

    val tabHome = NavGraph(
        // ...
    )

    val tabSettings = NavGraph(
        // ...
    )

    val root = NavGraph(
        route = "root",
        startDestination = /* ???? */,
        destinations = emptyList(),
        nestedNavGraphs = listOf(
            tabHome,
            tabSettings
        ),
    )
}

I tried setting tabHome.startDestination, but it throws IllegalArgumentException.

java.lang.IllegalArgumentException: navigation destination start_screen is not a direct child of this NavGraph