Groups for WooCommerce

Using WooCommerce Subscriptions and Groups for WooCommerce you can currently create a subscription product with variations. However all the variations have to add/remove from the same groups. I’d like to have variation specific groups. That way I can sell a Site Subscription product with Ebook and Audio variations. Then the Ebook variation will add people to the Ebook group and the Audio variation will add people to the Audio group. Right now I have to handle it all as separate products.