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The easy solution is to use ubuntu 21.04 or later which properly integrates pipewire. Ubuntu 21.04 also defaults to wayland (intel and amd only) so pipewire screen sharing should work out of the box.
$ aptitude search pipewire
p gstreamer1.0-pipewire - GStreamer 1.0 plugin for the PipeWire multimedia s
p gstreamer1.0-pipewire:i386 - GStreamer 1.0 plugin for the PipeWire multimedia s
p libpipewire-0.2-1 - libraries for the PipeWire multimedia server
p libpipewire-0.2-1:i386 - libraries for the PipeWire multimedia server
p libpipewire-0.2-dev - libraries for the PipeWire multimedia server - dev
p libpipewire-0.2-dev:i386 - libraries for the PipeWire multimedia server - dev
p libpipewire-0.2-doc - libraries for the PipeWire multimedia server - doc
p pipewire - PipeWire multimedia server
p pipewire:i386
pipewire is in Buster's (current Debian stable) repo, but it probably is older version than Ubuntu's, try and see.