Sell customizable bundles

We'd love to be able to sell digital product/course bundles through Ontraport. Currently customers can select quantities for multiple products at checkout, but there is no way to limit how many selections the customer can make. For example, if we offer 12 courses that we would like to sell as bundle of 3 courses per bundle, there is no way to limit the customer from selecting only 3 courses at checkout.

We have been able to accomplish this using WooCommerce's Product Bundles extension, but would ideally like to move all our transactions into OP so we're not relying on integrations between WooCommerce and Ontraport.