Yes, you can import Google Takeout emails to Office 365. Try the Aryson MBOX to Office 365 Migration Tool nd it made the process much easier. The software directly uploads Google Takeout MBOX files into Office 365 mailboxes without requiring Thunderbird or any other email client. One thing I liked most was that it maintained the original folder hierarchy, email formatting, and attachments. https://www.arysontechnologies.com/blog/import-google-takeout-emails-to-office-365/