How can I get the containing application when implementing `UNNotificationServiceExtension`?

Question

I have one distribution target and many target products, and I want one extension target to be available for all my target products and still be able to identify the application that will receive UNNotificationRequest.

Is there a way to get the unique identifier of the containing application through the Apple API? Alternatively, since the extension of the notification service is considered embedded binary, is there any way that the build process can enter some value at compile time so that the extension identifies the purpose of the product that just built it?

What I try to avoid is to have nservice expansion goals for each of my target products n.