I'm making a hydraulic schematic using custom origin/destination arrows. In these symbols, the number in the middle is often incorrectly oriented because this number is just plain text. I've had assemblers and service techs complain about the weird orientation, I'm trying to correct these.

The number in the middle is just plain text. Is there a way to change this number to an attribute so I can control its rotation, or is there some other way to keep this number from rotating?