If you open steam (windows app, no clue for steam deck) you can create as many lists as you want. The only issue is that it's not automated and you need to manually add them. However there are also dynamic list.

Aka while it's not exactly what you want (i think?) you can create tons of list, so check online for a guide just to ensure it's clear how to.

Also, did you know you can always check what games you played as if it was a calendar? this also can help you check what games you actually enjoyed playing. But yeah, i forgot how to access it, nevertheless, end of year soon so steam will show it to you soon enough

I see ability to create lists.
But those are list to manage my games.
Yes, i can create a list for games that are interesting to be gifted. But I need to get into the list, select game and from there go to store page and check price.

My idea is a list with a view like "wishlist", so thumbnail, name/shot info, price/discount
All in a single page. And may be notifications if something in there is discounted