See https://jayd.ml/games/2020/05/19/epicgamesstore-uri.html
Fixes GTAV. Still has working icons too!
NOTE
If you used steamsync prior to this, I would delete your current shortcuts.vdf and rename the original one (shortcuts-{earliest-timestamp}.vdf.bak) shortcuts.vdf. Since this version of steamsync uses a different shortcut format, if you don't do this, each game you add will be listed twice.