Custom webhook header missing in new relic

I am trying to integrate Auth0 with New Relic using custom webhooks. JSON content is successfully getting posted to the New Relic’s payload url and logs are appearing in New Relic but the message header is missing. Is there a way to send the json message with a clear subject on what type of event is for eg, login, registration, or password reset?
I have to search with my name in new relic’s log filter as below: