This article shows how to do any Jira Cloud REST API calls that haven't been implemented into Exalate by making requests with the Jira Cloud HTTP client directly in the script rules.
You can check the Jira Cloud REST API calls that can be useful for your specific configuration case.
Below you can find some examples of how Jira HTTP Client can be used in Exalate configuration.
Automatically sync all sub-tasks when the parent issue is synced
Transition outgoing issues automatically