Secure Sentinel notify webhook with shared secrets

This is a feature request to enable sending a header with a shared secret (something like X-OZ-Sentinel: abdef123456) to in order to secure webhooks listening to events from Sentinel. Right now the only workaround I can think of is adding adding a shared secret as a query parameter in the Webhook URL (ex. https://example.com/api/webhook?secret=abcdef123456).