It’s been a little while since I used Steam but you used to be able to do that from their own website, I think it was store.steampowered.com (I am guessing the website from memory). My game PC wasn’t my main PC so I didn’t even had Steam on that pc and it was what I used to buy the games - don’t really remember if I wishlist too because I use bookmarks in web browsers and folders for the bookmarks.