Sync 2 Calibre Libraries, MacBook-Mac Pro

I am trying to figure out to sync the Calibre libraries I have, one on my MacBook Air and one on my Mac Pro.

I have been manually copying the libraries to the iCloud and merging them, but this is tiring.

Can I do a final merge of both libraries with the copy in my iCloud, and then direct Calibre to access that library when it opens on either computer??