Following this post and doing a pause on all other current personal projects, I finally found some time to start to implement it…
Not yet finished, no official release yet, but source code is already available on github
Current version is usable, but please also note, due the bug explained here, plugin currently can’t manage properly more than one note 
(you can create more than one one, they’re properly managed/saved in document, but on next document reload, it’s not possible to access to all notes content and saving document in this state will lost notes data…)
Grum999