If it's got 2 sets of wires going into the box, there's another outlet daisy chained to it (assuming both romexs are connected to the outlet).
May not be room to daisy chain another outlet off of it (but an outlet with push connectors and set screw connectors might work? or) or you have to splice a new lead into the source, in that box.
But do you understand how much you can pull off that one circuit and what the loads are currently on it?
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5โ turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold