Answer by Chan K. ·
I think right now there is no direct way to do it, because there is only 4 options for you to choose from, when configuring user tag.
Work around might be, make the header attribute to be a request attribute, then use the request attribute as your user tag.
But the feature of "server-side-request-attribute-as-user-tag" is in EAP or Beta I am not quite sure:
Hope this helps,
User Tag - Server Side Request Attribute 3 Answers