Create virtual audio sinks for pipewire automatically using a system (user) service.
With the patchbay software helvum the audio can then be routed/multiplexed for e.g. obs.
It per default loops back to the default audio output.
# Create the script to unload the sink automatically
mkdir -p ~/.local/bin
nano ~/.local/bin/unload-virtual-sink.sh
chmod +x ~/.local/bin/unload-virtual-sink.sh
# Create the service