It's a tweaked version of GR author notes plugin (Terisa has posted a fixed version here:
https://www.mobileread.com/forums/sh...8&postcount=54).
I just edited a bit the html inside its authornotes.py and changed the plugin name to GR Author notes
"2". Modified plugin is attached.
I took a look at Summernotes and couldn't figure how to install it. In the past I'd use Macromedia Dreamweaver for stuff like this (I call it mixed code). This time I used a text editor and some (a lot of, actually...) Calibre restarts.
And I had to tweak the BD styling with some negative margin:
Code:
#_bio div {margin-left: -30px !important; }
(Also, I can't remember where I got a Bookerly font download,
maybe here, but it's necessary to have it installed for it to look exactly like that screencap, otherwise you can do search and replace for Bookerly in authornotes.py)