Yes it should work for anything that you add to your library though it hasn't been working for me lately, probably because I'm on the Steam client and Decky betas. I'm not too picky about tracking my playtimes so I haven't really bothered fixing it. Should work though!
It's a plugin for Decky which is a free 3rd party plugin manager. Goto decky.xyz from your deck and download file, make sure to run it from your desktop. Then go back to game mode and hit the "..." button to access it
This plugin is HLTB for Deck. They're also using SteamGridDB to get the custom D4 art and the game's metadata. Game Theme Music, vibrantDeck, and ProtonDB are all musts as well