Permanently assign application to audio sink?

I used the ujust command to create the Game, Browser, Voice etc channels/sinks on my Bazzite install, now I want to make sure that every time specific apps starts playing sound they get automatically assigned to the correct sink.
This is quite easy with apps that allows me to set its default output, such as games or Discord, but specifically Firefox I have been fighting a bit with, especially since it seems to spawn new instances of itself in Pipewire (qpwgraph) every time a new video starts playing etc.
Any tips on how to get it to always go to the Browser sink?
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