Style Customizer and Templates

I make a template with a property called Text (String).
I put it in a window.
I add to the object a new local property called UnstyledText (String).
I open the Style Customizer and program Text to switch on UnstyleText values, producing a new string.

It doesn’t work, I have no changing text.
The same procedure starting from a normal Label (not a template) works.

Any suggestion?
Thank you!

I apologize for a delay in a response. Are you still having trouble with this? Could you maybe show us what you’re trying to do, and elaborate a bit more on what you want the end result to be?