Virtual 7.1 pipewire sink: route through headphones only

Is there a way to route filter chain sinks through one audio device only in pipewire? Right now the sounds always plays on both speakers and headphones. I tried sonusmix and even locked both ends but it didn't work. The only thing I can do is turn the speakers off, but I like to use them when not gaming (which is what the headset is intended for).