Calendar Recognizing "Free" Events in Gcal as Available to Book

I put everything on my calendar, including designated space for calls.
This means I create "events" in my calendar like "Call Time" so I remember to keep that space open for bookings.
These events are set to "Free" which is an option inside Gcal.
Every scheduling tool I've used (4 or 5 at this point) has been able to recognize those "free" events as bookable space in the calendar... except Ontraport.
The Ontraport scheduler is unusable for me until this feature is added.
Hope it gets updated soon!