In the Navigation tree, we can click on a Bookmark and the canvas is centered in its content.
It would be also useful (at least for me) if in an Annotation we could create a link to a bookmark.
In my case, I tend to create individual bookmarks for the SQL sentences used in Readers and Writers or for code samples of the PythonCaller or SystemCaller...
The idea is adding an Annotation to the Reader/Writer/Transformer with a short sentence about what they do and a link to the bookmark where extended information can be found.