One can use templates to define "custom tooltips" for columns in the book list. The tooltip can contain whatever you want as long as it can be generated by a template. Tooltips interpret HTML so you can construct complex displays. One test I did was to include in the tooltip the note for the value where the note contained a picture.
If you change the tooltip for "title" then the changed tooltip is used in the cover grid as well.
To define a column tooltip, right-click on the column header and choose "(Define|Edit) column tooltip ...". It is also available as a calibre action, which means it is in the All Actions menu, can be given a shortcut, and can be added to context menus, favorites, action chains, etc.
You can include the text that would have been used for the tooltip. See the help text when you first create a column tooltip template:
Quote:
Notes:- The template global variable "column_lookup_name" contains the column lookup name.
- The global variable "original_text" contains the original tooltip text.
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This feature is in calibre source now and will be included in the next preview or release.