I wrote a bluetooth HFP/HSP add-on for Kodi that requires Ofono w/ Pulse Audio and Bluez (gist of this process can be found on Scribbles by searching for "RPi HFP stretch"). This runs fine on Raspbian , but Kodi is busted on Buster...
I see LibreELEC runs Leia on the RPi4 and uses Pulse Audio, but is it possible to install Ofono?
Edit: Doh! Packages. Got the HSP end of my add-on working with Bluez. Now attempting to build a package for Ofono to restore HFP calling.