As of this time, Capture One is not part of our import, export or editing process. The interoperability between both applications would have to be on the file system level.
With that being said, changes made to a local copy are viewable in Mylio if it the photos are added within Source folders. When you import Source folders into your Mylio library, you are asking Mylio to simply keep track of, or ‘reference’ the photos in their original location instead of copying them to the Mylio directory. Mylio will then continue to monitor changes made to the watched folder and all photos it contains.