how can i access to requester additional filed

how can i access to requester additional filed

hi,
in ServiceDesk Plus, when we go to Field and Form Rules > Rule execution - On Form Load >  Event - "On Form Load" > Actions - Execute Script,

I can access some of the requester details like (Requester - Job Title...), but I can't access all details like the Reporting To field or any User additional fields.
I'm trying to execute the following code but it doesn't work
var x=$CS.getValue("REQUESTER.REPORTINGTO");
$CS.setDescription(x); 

Can you help me, please?

                  New to ADSelfService Plus?