Let me know if you would be interested in developing a bit more to this nyxt browser feature to support persisting these extensions via the W3C Web Annotation protocol - https://www.w3.org/TR/annotation-protocol/
I've been wanting to write an implementation of an annotation server, and it'd be cool to immediately interoperate with nyxt browser. Then I'd work on the same server supporting most other browsers (e.g. Firefox) via WebExtension API building on my old https://github.com/gobengo/web-annotation-extension
i wrote up a white paper a decade ago imagining a wikipedia like 9verlay on websites that would add a meta level of user interaction. just takes some advanced fingerprinting of the annotated content and some social media like subscription and blocking mechanism. it was called _wikilay_
I've been wanting to write an implementation of an annotation server, and it'd be cool to immediately interoperate with nyxt browser. Then I'd work on the same server supporting most other browsers (e.g. Firefox) via WebExtension API building on my old https://github.com/gobengo/web-annotation-extension