Migration from Google Drive to iCloud
How to transfer data from Google Drive to iCloud
MacBook
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Sign in with the Apple ID and password ( the apple id and password that is same as gmail address already signed in Mac system preferences > iCloud ) in google drive ( if you are using a single Mac open a new tab use command and T tab ) and see this article https://support.google.com/accounts/answer/3024190?hl=en
You can then import the data in iCloud Drive in your Mac .