If I understand correctly what you want, I don’t think this is possible. You basically want to filter all files in your vault within a bases formula, and to my knowledge, that isn’t supported by any function.
You would need some way for the files to already be linked in order to obtain the path of the chapter file, or your chapter filenames would need to be constructable from the properties of the scene notes (for example: examplePath/knownText/part/chapter).
Are there any links between chapter and scene files?
EDIT: If linked, something like this would be possible:
But if you don’t want to change your properties to hold links, you could modify your concept of the base to one that simply returns all your chapters and scenes grouped by act-chapter numbers and sorted by scene number. For example: