If you are facing a wall-plate with two power sockets on it side by side and you are telling someone to plug something in, which one would be "the right socket", and which would be "the left socket"?
If above the wall-plate is a photo of a person and you are someone to draw a tattoo on the photo, which is "the right arm" and which is "the left arm"?
ETA: and if I were telling someone which socket to plug something into, it would absolutely be from the prospective of the person doing the plugging, not from inside the wall.
Same language, opposite meaning because of a particular noun + context.
I think the only thing obvious here is that there is no obvious solution other than adding lots of clarification to your prompt.