Not that I know of, unless you want to design a code change for it. It seems a bit of a waste of a port. Sparky2 has an extra port dedicated to LEDs (can be used for other things too).
I can maybe understand wanting a beeper, but if you want an LED, the WS2811 is so simple and works so well. Cheap too. You solder a servo connector/cable to the LED, plug it in to an unused servo/ESC connector, configure it, and it is done. Not only does it show armed or not armed, it tells you why it won't arm and problems/flightMode after arming.