If you create a PWA on Linux all it does is drop a new ".desktop" file in `$XDG_DATA_HOME/applications`, which you can then inspect to see what flags it sets. I imagine it's mostly the same flags as used on other platforms.
Oh, wow. Thanks! I will totally look at that!! I was even trying to look for strings within the Mac binary, and browsing around the repo for the PWA creation code (which I didn't find). I'm super curious what's in the .desktop file. I'm definitely going to check that out this evening.