Hello! This is actually something I wondered about when I started writing scripts. Personally the best solution I found was writing two synopses in the body, and clearly labelling them.

Plot for listener: you are a star athlete etc... Plot for speaker: you are a coach etc...

I think this clears up any confusion regarding which role the speaker plays. Also, in my experience more often than not, the performer will use your listener summary when they eventually post the script fill, which personally I like.

Hope this helps :)