Screenreader says....

I was wondering if there is some sort of documentation out there that helps
writers and developers know what the screenreaders will say when certain
code is used. For example when <li> is used JAWS automatically tells the
user, 1 of 2...

I'm trying to work out how to set copy writers up for success and avoid
duplicating descriptions that may already be programmed to be said. Maybe
I'm using the wrong key words? I also thought about starting one if it
doesn't exist, is there something nuts about this thought that I'm
overlooking?

Thanks for any input!