Add or change a recovery email address
On your iPhone or iPad, open the Gmail app . Tap Menu Settings your account Manage your Google Account. …
At the top, tap Security.
Under “Ways we can verify it’s you,” tap Recovery email.
From here, you can: Add a recovery email. …
Follow the steps on the screen.
https://www.emailssupports.com/blog/recover-google-account-on-iphone/