Is your feature request related to a problem? Please describe.
Text formatting is not sufficient to explore and study a text.
Describe the solution you’d like
I would like to make a selection and create and annotation object, in almost the same way I can format a text background color. But there would be possible to create layers of annotation. Each layer have non-overlapping annotations.
On the top of the page the annotation layer could be checked one at a time.
By pressing Ctrl and hovering the mouse cursor over the annotated part, it would show a hint text of the annotation object. By pressing Ctrl and clicking on the annotated part, it would be possible to navigate to the annotation object.
Describe alternatives you’ve considered
It could be thought of as multiuser comments over a text