I think this plugin idea would be useful for SEO but also to improve the variety of words and style used.
A panel that works at the level of an active note but also (especially) at the level of a folder.
The panel, at note level, would indicate the frequency of each of the words in the note (with the possibility of preventing a list of stopwords from appearing).
Another, more succinct panel would show at a glance the frequency of a list of words previously indicated.
It would be great if the plugin could work at folder level, in particular to find out how often a selected list of keywords appears in the notes of that folder.
For a topic cluster organization of content, this would be simple but effective. Other elements at folder level could be indicated: list of tags or links.
What do you think?