Adding a variable as a placeholder in a numeric entry!

I have created a numeric entry box so that my students can adjust their budget categories.  I have placed this box on top of the old text because of space.  I wanted to add the variable with their old amount as the placeholder in the numeric entry box, but when I publish the file, the reference is shown in the box and not the actual variable.  Does anyone know if it is possible to have a variable as a placeholder?  Thanks in advance.

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