Currently, WP All Import does not support importing from password-protected Google Sheets. This feature would be extremely useful for handling partially sensitive data.
In our case, we maintain a large Google Sheets document containing COGS (Cost of Goods Sold) and other sensitive information. We do not want to make this file publicly accessible on the internet. Exporting and uploading a new CSV each time is cumbersome, so the ability to import directly from password-protected Google Sheets would greatly improve our workflow and security.