I don't know if this matters but I found this directory:
$ pwd
/home/richard/.pipewire-media-session
$ ll
total 8
-rwx------. 1 richard richard 101 Aug 29 2020 default-profile
-rwx------. 1 richard richard 174 Aug 30 2020 default-routes
$ cat default-profile
alsa_card.pci-0000:08:00.1 output:hdmi-stereo-extra2
alsa_card.pci-0000:0a:00.4 output:analog-stereo
$ cat default-routes
alsa_card.pci-0000:08:00.1:output:hdmi-output-2 mute:0
volumes:2,1.000000,1.000000
alsa_card.pci-0000:0a:00.4:output:analog-output-lineout mute:0
volumes:2,0.368683,0.368683
Interestingly it doesn't seem to have been updated since Aug 2020.
Thanks,
Richard