Perhaps when the stovetop is folded over you can gain access to this area...
I have a similar setup on my STARCRAFT but the 20A SERVICE PLUG is in plain sight and can be plugged into a 120VAC 20A SOCKET mounted in my wrap around seating arrangement...
Look for some obvious screws perhaps that may have to be removed to gain access in the cabinet...
Some installs have the plug/socket up high next to the ceiling like shown in this photo...
May be hidden by the valance curtains...

google image
Hope you figure out the access haha...
Roy Ken