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I found out that you can configure rofi to launch a "Favorite Apps", like here: https://github.com/luiscrjunior/rofi-favorites, credits to luiscrjunior. As you can see, this reads a special gnome favorite setting that shows an array of your favorite apps. Adding stuff to this array is quite a pain: https://askubuntu.com/questions/1193496/add-app-to-favorites-from-command-line , you literally need to run the same command everytime and manually alter the array.
Otherwise, you can always create a rofi menu that displays whatever the hell you want. No need to use that gnome favorite manager, if that's the issue. You would need to manually add the application to the file, though. I just found this example, but there are plenty out there.
https://github.com/davatorium/rofi-blezz makes it pretty easy to add whatever you need.