I have not tried to install this yet, but I had browsed the online manual. (I wanted to know if its editor implemented styles - to which the answer seems to be "no".) It appears that QW wants to create
scenes as must markers within the chapter.
While it should be theoretically possible to export and merge scenes into chapters outside QW, that seems like rather a PITA to me.
Have you looked at
yWriter? It focuses on scenes.