Regrettably, there is no obvious solution to this problem for now. We have to either wait (or rather hope) for a fix or rely on special software. For example, according to Google, their G Suite Sync for Microsoft Outlook syncs all items including mail, calendar, contacts, tasks and notes in both directions. A few alternatives are described in How to sync Google Calendar with Outlook.
That's how you share Outlook calendar with Google. I thank you for reading and hope to see you on our blog next week!