From my experience you wont nessisarrly need the spoke if you use the service graph connector. The service Graph connector imports large amounts of Intune data into the ServiceNow CMDB while the spoke can be used for in IntegrationHub to do individual things like "Get managed Applications", "Look up managed Applications", "Update Managed Devices"... things like that. You would build a flow with the spoke to do differnt actions while the service graph securely manages all of your devices with a single endpoint solution. Hope this helps.
