Add a game not available in my region, to my wishlist?

Hello,

I would like to enter giveaways for games that aren't in my region (that I cannot purchase).
The easiest way to do that is by adding them to my wishlist.

However, the "add to wishlist" button is only available on the store page.
When I try to access the store page for these region-locked games, I get this

Help and thank you