Local Swift Packages: prevent certain Products from being added by default

I'm implementing Local Swift Packages for all of our features and it's going pretty well. However, because I need a separate Previews target and don't want to expose my mocks to consumers that only want the implementations I also have "private" libraries that I prefix with an _ as a hint that it's for internal use and shouldn't be touched.

When I add the Swift Package, they are being added to the Target by default:

This is highly undesirable as @testable import would break the build, and if it wouldn't, I would be compiling Mocks without ever using them.

Is there a way to would make certain Products not being added to the Target by default, like in the screenshot below?

I think there are many use cases where you want consumers of your package to not add all Products by default, but still want them to be able to do so if they really want to.

Is there any way now? If not, what's the process of getting this feature added?