The current release (1.1.9) of the provider does not support the Service Incident Rule or an analogous resource.
In OpsGenie Terraform, we previously had service_incident_rule
(reference).
It has been mentioned that this will be provided via JSM Automations, but we still don't have a 1:1 mapping. Are you planning to add support for this resource?
I assume it would happen after Support for Services Resource is released.