Don't you have to install a distro to run these things? LibreElec, for example, is a distro set up to run Kodi, I think. There is a version of LibreElec for BerryBoot that I had installed on the Pi 3; it ran pretty well. Unfortunately, there isn't one on the BerryBoot website for the Pi 4. You can get LibreElec for the Pi4 on the LibreElec website, but it has to be adapted in some way to be installed on the BerryBoot booter.