// ....

@ObservableState
public struct Feature: Equatable {
    var childs: IdentifiedArrayOf<ChildFeature.State> = []

    // ....
}

ForEach(store.scope(state: \.childs, action: \.childs)) { store in
    ChildFeatureView(store: store)
}

if let store = store.scope(id: childFeatureID, state: \.childs, action: \.childs) {
    ChildFeatureView(store: store)
}