Compatibility with Registrations for Woocommerce

Is it possible to get the plugin compatible with Registrations for Woocommerce?

f ex select 2 as the family member option on this page with a variable product https://nordichf.org/wordpress/product/hf19-conference-participant/ and additional text fields will show up where the family member names could be entered.

But if the product type is registrations the extra fields doesn’t show
https://nordichf.org/wordpress/product/hf19-conference-participant-registrations-product-testing-purposes-only/

The page I need help with: [log in to see the link]