Adding text before or after an equation in custom properties

I know how to link a custom property to a variable in the model, but is there a way to include text before or after it?  Let's say I have a model of a beam and my "description" custom property says "Tube length = (actual tube length of model)".  If I just link the property to the variable of the model, the length updates accordingly.  I do not want just the length in the description, I want the "Tube length =" in front of it.  Anytime that I try to add text, the equation will not solve.  I have tried to put the equation in several types of brackets to segregate it from the added text with no success.

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