I've no real experience with this exact bike yet so that port might already be in use for a power socket or SOS etc. . So it might need a BMW loom spur to double up.
Failing that, it's pretty easy to add a USB socket straight to the battery. Thunderbox etc.
I prefer that option for myself and my customers. You get full control over it. Instead of the whims of the bikes control unit deciding when and when you can't draw power etc.