Not sure. I mean, I don't use the Gmail app and can only assume the answer is no, unless there's an option/setting for it within the app. Hopefully, members who actually use the Gmail app will reply soon.
I've never been able to access my to dos through the app, just reminders through the side bar on the left. However, I highly recommend Wunderlist since it syncs between all your devices and is super easy to use.