I’m glad to announce that we’ve recently launched new webhook event types:
issue_property_set(triggered when issue property is created or updated)
issue_property_deleted(triggered when issue property is deleted)
You can now register webhooks for this type of events in your Connect Apps (statically - via module descriptor or dynamically via REST API) and in Jira Administration.
More info here: https://developer.atlassian.com/cloud/jira/platform/webhooks/
If you have any questions or requests, don’t hesitate to let us know.