I worked at goodreads and also built https://www.gamerankr.com. Getting an app that feautee multiple types of media and does a great job is really tough, also it’s not the way most people like to organize (when folks look for a new video game, they’re usually not also looking for book or movie).
I’d love to know more about why you’d like them combined, and how you envision a unified tracking app working.
I just manually added mine to howlongtobeat. Sorting by time to beat, date released, etc. is pretty awesome, as well as the fact that it can do multiple consoles.