Based on this mic pinout:
the cable will look like this:
GX16-6 pin 1 (Modulation) → Audio 3.5mm TRRS ring 1 (RIG_AFIN)
GX16-6 pin 3 (PTT) → Audio 3.5mm TRRS ring 2 (RIG_PTT)
GX16-6 pin 5 (Shield) → Audio 3.5mm TRRS sleeve (GND)
3.5mm TRS tip (Phones) → Audio 3.5mm TRRS tip (RIG_AFOUT)
3.5mm TRS sleeve (GND) → Audio 3.5mm TRRS sleeve (GND)