Postfix is one module (and this is rare, most modules don’t have this kind of help, though I wish they all did) that mentions which directive an option modifies in the tooltip help file. So, you can search for a Postfix directive by name, and see the help file which identifies which option in the UI modifies that directive.
I trash talk AI a lot, but I think this is actually an area we might be able to use it to reduce tedious work with low risk to code quality. It takes hours to go through and map out the directives to the options (because the options aren’t always named the same in the Perl code or the HTML), and AI has actually gotten pretty good at the tedious rote stuff like this. I’ll see if I can figure out how to wire up something so we can make Search more able to help in situations like this for modules where people haven’t gone through and spent countless hours adding those clues to the help files.