Jeff:
For this type of problem, I recommend taking the "Builder Dimension 11" marker, making a copy of it, then modifying its script to display as you described. I took a quick look at this part, and there is a parameter called
Separator that can be changed from "x" to "/". The superscript will take some work in the 2D Script, but starting with an existing part will save you a lot of trouble as the rotation issues, door dimensions, etc are already there, as opposed to starting from scratch.
HTH
David