如何将FAB锚定到有边际的BottomSheet？

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- BottomSheet布局 -->
    <LinearLayout
        android:id="@+id/bottomSheet"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_margin="16dp"
        android:background="@android:color/white"
        android:orientation="vertical"
        app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">

        <!-- BottomSheet内容 -->

    </LinearLayout>

    <!-- FAB -->
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="16dp"
        android:src="@drawable/ic_add"
        app:layout_anchor="@id/bottomSheet"
        app:layout_anchorGravity="bottom|end" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>