How do I display the parameter selection as the field header?

I have a parameter called Select a Target, which has "Forecast" and "LY" as options

I have a calculated field called Selected Target, which displays either the Forecast value or LY value depending on the Select a Target parameter selection.

However, in my Viz, rather than the field header being called "Selected Target", I would like it to dynamically update based on the parameter selection, either to "LY" or "Forecast".

Is this possible?

Thanks