Search iOS App Store by sharing features included with app
No, there's no way to search the App Store like that as Apple doesn't expose that data. Most apps don't even list the ability in their description text, so while you could try running a Google search, e.g. https://www.google.com/?ion=1&amp;espv=2#q=site%3Aitunes.apple.com%20text%20share%20extension, unfortunately it won't work too well.