[aframe]

Connect the iPhone to your mac with the lightning to usb-c charging cable and enable it in the Audio Devices app on your Mac. You can then use the iPhone as you mentioned by selecting it as an input from the Mac’s Sound app.

I know OP mentioned Bluetooth, but as a work-around to not having audio cables. Hopefully this would fit the bill instead.

[econcon]

Yes, but does it work on android?

[aframe]

Should do, but if not by default and you’re running Android 10 then you would use adb and sndcpy.

[econcon]

But it only supports sending audio from phone to pc, not reverse.