Power Raspberry PI4 from HAP AC3 USB?

On occasion I have used the USB port on a hAP ac lite to provide power.  It is not a lot of power like some USB C devices would expect but does work.

However ... if you have to boot, reconfigure ... or do anything to the hAP you drop power un ceremoniously to your other device.  I don't think the power is pass thru while the hAP is off ... so while I might use this for temp wiring I always prefer to have each device on it's own power supply.  

I once used the hAP to power a dumb switch I was using for extending LAN.  When I would power up, the devices would all come online at the same time which gave me a bad sequence of finding and assigning ip addresses ... it's just clunky.  It's now on it's own power supply.  If you have power it's easy to make USB 5V somewhere.

Ed