How to determine Form Function name in forms personalization?

I'm creating a forms personalization in which I need to get the form function name that opened the form for the user when they launched it from the navigator menu.  I am aware that I can get the form name from SYSTEM.CURRENT_FORM but was wondering if there was a similar way to get the function name.

Is there a way to determine the Function Name, as it is shown below?

Context:

I have several custom functions on a menu that will drive different behavior on the form (setting the value of a local variable).  Rather than create a series of separate function-level forms personalizations with redundant code, I want to create a single form-level personalization and examine the function name in a case statement to set the appropriate local variable value.