How do I add text to a plot. I mean not as a text item in the actual Plot, but in the cad drawing itself. I would like to use this in Cad, because

• I would like the text to show up in multiple instances of the plan in plots (top view whole venue, top view stage, top view house, section stage, etc.)
• I would like some annotations to show up in exports
• I would like to be able to set some recurring symbols apart (like DMX movers), so they are easier to recognize 

Right now for example, I would like to add a centre line symbol ( ℄ - this is plain ASCII text btw), but I cannot find a way to add it.