How to find value of built in parameter without knowing category?

Hello,
what I originally wanted to find out is how to find out to extract all information what is marked yellow because I only get null (red marked). How I understand it now, it is not that easy as I imagined to extract the information from the BIP but I need to create my code for every single parameter. Is it right, would you agree with me?

(like here: Sum of Gross Area)