Not sure it can be done via that, it is data only I would think.
There is a way to get power, some of the after market releases use a switch and the power from one led front arm lights on drones.
But what are you wanting to drain power from the mini for ?
Even though a tiny power draw (depends what you're doing though, single led for VLOS, or much more needed ?) taking power away from the mini flight time seems detrimental overall, especially seeing as they have 'insufficient power' problems at times.
The stand alone strobes (some of which can be set to permanent on) that have their own little rechargeable lipos are pretty easy to use, and last 2 hrs for some, 6 hours for others.