Adding Non-Editable Labels to Counters?

I’m working on making a module for Minden Games’ Poor Bloody Infantry, and I want to make it so that when a soldier is wounded or killed, the player can right click on the counter and add a label that says wounded or killed onto the counter. The only way I’ve been able to do this is to add two text labels, but they are editable fields, and I don’t want them to do that, I just want the text Wounded or Killed to appear on the marker. Does anyone know what to do, or at least point me to the right part of the manual because I can’t seem to find it in there.

Use a transparent image of the text from your favorite graphics editor instead and use layers to control the images