Allow users to limit the visibility of the widget on certain subdomains

I have a course in Teachable with a LOT of lessons, and I also have free courses in there. If I include the embed code of the search widget accessible to the whole domain, the users who access my free courses also see the widget that contains the content of my paid course. It would be great if you created some kind of embed code that allows users to limit the visibility of the widget on certain subdomains, and not just on the whole domain, so that I can make the widget only accessible to the lessons inside my paid course specifically, and I don't have to manually add the widget to each lesson.