How to properly add files to Products on woocommerce?

Question

WordPress

I add a product (the catalog is made on woocommerce).
It is required to add a tab (as Main) "Documents" to the admin panel of the product card - I did it.
Place files on this tab - a repeating block.

With the help of custom fields - I understand how to do it, but how to make it a standard woocommerce functionality? Goods can be downloadable - here are the files and load them, only transfer this functionality to the "Documents" tab?
The downloadable items will appear in the order form in the user's email. I don't need this feature. (YITH WooCommerce Catalog Mode - I use catalog mode). Therefore, I need to display immediately in the product card.