Koin share dependency scoped to nested graph

I'm wondering how to properly scope dependencies with Koin library.

Since Google recommends a single Activity architecture the AndroidX Navigation lib has become a key library to facilitate this by easily swapping Fragments.

A typical modern Android app has multiple features separated in packages and/or Gradle modules.
These feature modules provides a graph that can be used in the root graph as nested graphs. (See picture)

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root_graph"
    app:startDestination="@id/mainFragment">

    <include app:graph="@navigation/nav_graph_feature_a" />
    <include app:graph="@navigation/nav_graph_feature_b" />

    <fragment
        android:id="@+id/mainFragment"
        android:name="com.example.androidx_navigation.MainFragment"
        android:label="MainFragment"
        tools:layout="@layout/fragment_main">
        <action
            android:id="@+id/action_mainFragment_to_featureAFragment1"
            app:destination="@id/nav_graph_feature_a" />
        <action
            android:id="@+id/action_mainFragment_to_featureBFragment1"
            app:destination="@id/nav_graph_feature_b" />
    </fragment>
</navigation>

Following rules should be respected:

• Every layer represent a scope.
• Inner layers can inject anything defined in outer layers.
• Layers that do not have an overlap should not be able to inject each other's dependencies.
• Leaving a layer should dispose of its dependencies.

More concretely:

• FeatureA can inject Activity and App dependencies, but not FeatureB dependencies
• FeatureB can inject Activity and App dependencies, but not FeatureA dependencies

How to achieve this in Koin?

Note that sharing dependencies is not limited to ViewModel only.
I should be able to share any arbitrary class within my scope.

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