Do you need additional software for this? Can’t you use OBS as a webcam[0] and take its audio source? (I haven’t tried, but that’s how I’d approach it if I was going to).
Unfortunately, no, OBS handles video only, no audio comes through the camera. It's really frustrating, I have wanted to do some more complicated audio setups on a Windows PC (specifically bridging two calls on different platforms together, I know the latency would be bad), but you have to use the VB CABLE proprietary driver, of which you can only have one for free, or try playing with Voicemeeter (same company with old, proprietary software). I have tried Synchronous Audio Router, but I couldn't get it to work after hours of pressing buttons.
On Mac, I can just buy Rogue Amoeba software, and on Linux, I can just run some commands or download a GUI to route audio around however I want.
On Mac, I can just buy Rogue Amoeba software, and on Linux, I can just run some commands or download a GUI to route audio around however I want.