Contact LCI, they make one just for this application.
I had one installed on my last coach by LCI in 2017 at the National Rally.
There is a battery pack in the arm by the stairway, operating switch in that arm and comes with a battery charger.
No wires to run or switches to add inside your coach, everything is outside.
They advertise the battery is good for 22 cycles.
The Rally price at that time (2017) was $850.00 installed.
It’s a Solera Universal Awning by LCI.
Three guys came over to my site and installed it, one guy was the person who designed it, took about 1 1/2 hrs.
All above information above is from 2017.
Hope this helps in your quest, there is help available.
Hockster