Not sure if it entirely fits your use case but if you only need to do this on a small scale it is possible to using Google Apps Script oAuth tokens by adding additional scopes to your project. I’ve written about how you can do this here https://medium.com/cts-technologies/managing-google-cloud-storage-files-with-google-apps-script-without-using-a-service-account-3e8d0b34adc0
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