I know there is a separate Wishlist request on Canny but the description discusses more of a "share a basket" functionality.
This request is for more of a way for customers to save items for later. The John Lewis and Asos website show the functionality almost exactly as we would like it whereby a customer can "heart" an item both on the product page and on the category pages and these items appear in their "Wishlist" page where they can click back through to order them. It does not need to be attribute specific. Just a link back to the items page.
Our customers have requested this feature specifically. Particularly in an app we have recently launched. Our customers have said they currently copy and paste the links to products and save in their notes on their devices so it seems it is a feature customers would use.