"Include in my work availability" calendar integration feature missing from New Outlook

Outlook for Web used to have a great feature that allowed your personal Google Calendar events to affect your work availability, e.g., on a corporate Office 365 account. You can see some documentation of it at https://answers.uillinois.edu/ischool/page.php?id=128599. 

That feature is not available in the New Outlook. In fact, Microsoft changed the interface, and I can't even figure out how to access it now in Outlook for Web. 

This has already led me to mistakenly commit to attending an event when I wasn't available for personal reasons. Is this feature coming to the New Outlook? How do I access it in Outlook for Web?