I came upon this free web highlighting/outlining tool Eloquent that automatically creates an indented outline on anything I select, that I can then copy and paste into Remnote.
It works on multi-frame webpage (with adverts) where Remnote Clipper seems to struggle.
It has snippets to add the webpage title, url, date etc to the outline.
The documentation talks about bracket autocompletion and tags highlighting (which I’m yet to explore.)
Disadvantage is that it doesn’t have a method to capture images. (So, it won’t fully replace Highlights or Diigo in its current beta stage, but its interesting to note the automatic outlining, snippets to capture the provenance and date/timestamp etc.)
(Its documentation )
Twitter thread on the tool by its founder.