Follow the below steps to get your answer. Download and run the iCloud Mail Backup Tool on your local screen. After that, log in with the necessary credentials for iCloud. Then, mark the folders you want to migrate into Gmail. Select Gmail from the drop-down list and authenticate the login process. Now, click the Convert button to begin the migration process from iCloud emails into Gmail. In the end, you can also download the reports with the help of the Download Report button.