Failing to add Threat Intelligence Feed to Splunk ...

Splunk Enterprise Security

I would like to add an additional Threat Intelligence Feed to the collection of the Intelligence Downloads in Enterprise Security.
The Service-URL needs to have an authorization header to allow the HTTPS call.
So far i can't find any options within Intelligence Download Settings to add a custom HTTP-header with authorization Information like an API key.

Is there any option in the Standard configuration of Intelligence Downloads to add a custom HTTP-Header to the requests?

Or is there another extended configuration possibility?

Thx for feedback.

Failing to add Threat Intelligence Feed to Splunk Enterprise Security with custom HTTP Authorization Header

configuration

using Enterprise Security