Not sure I understand. Again, a USB device means that other USB devices on this hub  can snoop on everything you do with it. I was asking for the the 3.5 mm jack for microphone. The jack for audio out already exists.
 Not on this USB port but on all internally connected ports, too. On my Librem 15, there is only one USB hub, which means that all USB devices can snoop on each other, including the integrated camera.