I suppose you are talking about the "create collections from folders" functionality, so: yes. CM doesn't care how you organize your folders, it simply "mirrors" the folder hierarchy to a collection hierarchy.
In other words: you already have the folder hierarchy containing a folder for each author. You have to configure whatever software did that to leave out this intermediate folder. I suppose it was calibre (which does that by default, I think). I'm not an expert with calibre, but I'm sure that this behavior is configurable. So check your calibre settings...
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