EmuDeck installs EmulationStation-DE, which allows you to manage your ROMs through a single front-end application. It can either be used as an alternative or in tandem with Steam Rom Manager (an application that adds ROMs as game shortcuts to your Steam Library).
EmulationStation-DE's Wiki: https://gitlab.com/es-de/emulationstation-de/-/blob/master/USERGUIDE.md
EmulationStation-DE's FAQ: https://gitlab.com/es-de/emulationstation-de/-/blob/master/FAQ.md
Emulation-Station-DE Releases: https://gitlab.com/es-de/emulationstation-de/-/packages/
Read the Steam ROM Manager page to learn more about Steam Rom Manager and how it can be used in tandem with EmulationStation-DE!