GoToWebinar - screen share from an iPhone

If a presenter or panelist logs in from their iPhone, is it possible for them to share their screen in?  One of my regular presenters wants to show updates to a products mobile app, but we couldn't find a way of them doing so.

I've seen posts from 3-4 years ago saying at the time it was limited to iPads and other posts indicating this functionality might be included in future update - now we're in the future and I wanted to check if was on the roadmap and/or estimated time for inlcusion.

Many thanks,