Graph API - Difference in the response returned by EWS and Graph

Question

Hi,

I have developed an application using EWS Calendar.
I am migrating from EWS to Graph.

I'm stuck at Calendar's Get event handler.
The response between EWS and Graph is similar. However, there are some EWS fields that I can't find at Graph.

Those fields are:
RoutingType, AppointmentState, DisplayCc, Displayto, ExtendedProperty

DisplayCc, Displayto: Can I replace it with [attendees]?
RoutingType, AppointmentState, ExtendedProperty: What field can I replace it with?

Thanks for your help.