[DaltonST]

ABC is designed to be used in the Tag Browser, and to be treated just like Tags are. It also can work hand-in-hand, if desired, with the ABC Hierarchy plugin. Both text values are combined for synergy.

Extract from the OP's Installation Notes:

1. Calibre > Preferences > Custom Columns > Add a new custom column called "author_book_count" with a title of "ABC" and with the default "text, with column shown in the tag browser". Uncheck the new column to hide it. Save your work and restart Calibre.

2. Calibre > Preferences > Plugins > Load Plugin from File and load the attached zip file. Save your work and restart Calibre.

3. Calibre > Preferences > Toolbar > Main Menu Toolbar and then add the icon for Author Book Count. Save your work. Close the window.

4. If you don't want to see the count in the Book Details view, go to Calibre > Preferences > Look and Feel > Book Details and customize the view to your taste.

5. The Calibre tag-browser defaults to sorting by Text instead of by Numbers within Text. To change this: Calibre > Preferences > Tweaks > Recognize Numbers Within Text When Sorting > and set numeric_collation = True.