Only 2-channel stereo output via HDMI with sof-hda-dsp available

[testudomarginata]

Dear Maintainer,

my laptop with the following soundcard:

/proc/asound/cards:
0 [sofhdadsp ]: sof-hda-dsp - sof-hda-dsp
LENOVO-20QA0030GE-ThinkPadX1TitaniumGen1
lspci:
Multimedia audio controller: Intel Corporation Tiger Lake-LP Smart Sound Technology Audio Controller (rev 20)

plays stereo audio nicely via the integrated speakers.
My understanding is that the sound card should support multi-channel audio output (e.g. 5.1 surround) via HDMI, but even when using an HDMI output the only profile available in pipewire is "Play Hifi Music", which only provides 2 channel stereo. Is there a way to activate the additional channels?
Please let me know if you require any additional information.

Regards,
Sönke

System info:
ThinkPad X1 Yoga Titanium
Debian testing
alsa-ucm-conf version 1.2.8-1