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And there is no Pipewire option in in-game audio settings.
That's because we don't use pipewire, we use pulseaudio. Not sure where you got the idea that we use pipewire. You have to explicitly enable the pipewire service as your user as well as any supplemental services (and depending on the package set, possibly install it). You can see some of the details at https://dev.getsol.us/T9694, which @YakoYakoYokuYoku wrote. Bear in mind you don't need to switch to unstable, that was only applicable for that specific release. The Setup is the most applicable section.