The feature missing from Gmail's iOS app has been added and tested by Google!
The worst part of Gmail's iOS app is that it does not support third-party email providers, unlike Android.
If you're using Outlook or other Gmail competitors, and you like Gmail, you'll have to leave Gmail on iOS. However, Google seems to have begun to take steps to change. The company is looking for users who will test non-Gmail accounts that are added to the Gmail app.
If you are using the Gmail app to participate in the beta testing program, you must have an email address outside of Gmail, and you must be using iOS 10 or higher. Since the program is part of Apple's TestFlight program, we note that the information you provide to Google is shared with Apple. When you are accepted to the programa, what do you do from Apple ...