I may be misunderstanding what you mean exactly.

Here’s an demo showing how the scroll event works for pages both outside and inside a carousel.

It logs 0 for the outer page and 1 for the inner one. If neither is what you want then a more precise explanation would be appreciated.

Maybe you could provide an example showing what you are trying to do (a codepen would be preferred though not a requirement). That way we can find out where exactly the problem lies.