Hello together,
shortly I created a Calibre plugin for myself. You can see its name in the title. Its purpose is to extract content information from ebooks (actually PDF and EPUB), to be more precise from the bookmarks, and to write it to a user defined "#content" field. This field is then displayed in the details view of Calibre just before Comments (configurable).
If you are interrested, you can visit
my web page to get more information.
Also I append this plugin in this post.
It would be nice, if someone found it useful.