Got some traffic on Github repo and decided to keep developing this annotation import plugin. For your information, version 1.1 was just released today
New features

- Annotation list and single annotation preview views
- Support KoReader produced My Clippings.txt (menu->tools->export highlights->choose formats->check MyClippings
- Fixed bug of the need to scroll document before import
- status display of import process

Project link.
That's it for now!