How to add collection links in a product page text metafield (Mojave theme)

[FabriekStudio]

I'd like to add a new metafield with the name of the designer of the product. But I'd like to link a collection page dedicated to the designer product.

When I created the metafild text and I'm going to insert the section on the product page I have to decide to link to nothing, brand or type of product.

I'd like to link to a costum collection