How to run pipewire server with ROC sink

I am running qemu using VFIO. I would like to run this on a different seat but want the audio to go through a linux machine which isn’t always logged in. There is another machine which is has an ROC server running.

I would therefore like to forward qemu to the ROC server. But qemu doesn’t have native ROC support. Pipewire does. So I tried runing an instance of pipewire with native client for root /run/user/0 and added an ROC sink.

XDG_RUNTIME_DIR=/run/user/0  pipewire -c $PWD/pipewire.conf
[E][19:26:59.723340] mod.roc-source | [module-roc-sourc:  549 pipewire__module_init()] can't connect: Host is down
[E][19:26:59.723435] pw.conf      | [          conf.c:  602 load_module()] 0x5555555635e0: could not load mandatory module "libpipewire-module-roc-source": Host is down
[E][19:26:59.723469] default      | [      pipewire.c:  124 main()] failed to create context: Host is down

What am I doing wrong?