Webinar API - templates/branding

I am looking to use the same template for all webinars created by a new integration.

When calling the Webinar API (https://api.zoom.us/v2/users/{userId}/webinars), does the "template_id" need to be owned by the "userId", or can it be owned by any user?  Or is there an admin (sharable) type of template that we should be creating?

Alternatively, how can I do things like set the Branding settings of the webinar via the API?