using shortcodes inside gravity forms

I'm struggling to use a custom short code (added by some plugin named short code plus) inside a hidden input in gravityforms the short code is [user_firstname] which as it's obvious it shows the users first name no matter how i tried, it wont return users first name to my form entries if i use the short code inside a html type input it will be shown in front end of website and it works correctly but it wont be signed in the form entries . does anyone have a solution?