See your Google Calendar in Outlook
By importing a snapshot of your Google calendar into Outlook, you can see it alongside other calendars in the Outlook Calendar View. To keep the imported calendar up-to-date, subscribe to the Google Calendar in Outlook. If you don't, the only way to update it will be to import another, more current snapshot.
https://support.microsoft.com/en-us/office/see-your-google-calendar-in-outlook-c1dab514-0ad4-4811-824a-7d02c5e77126
