This suggestion issues out of the conversation that took place on this thread:
https://community.logos.com/forums/t/122946.aspx
To my knowledge, although it is technically possible to attach a note to pretty much anything that appears in the right in the context menu of a resource, most of these do not establish a meaningful relationship between the note and corresponding entity.
For instance, what is the benefit of attaching a note to a lemma or a root if one can see the note when looking at the corresponding lexical entry? What use is there to attaching a note to God as a Person datatype in a passage of Scripture, if that note will not be visible in connection with other occurrences of God as a person?
Finally, the OP in the other thread was trying to attach a note to surface text, treating as it were, as a headword. This is a legitimate request.
If I am mistaken (or ignorant) of how making a note on a lemma, person, sense, etc can benefit, I would appreciate some pointers from those in the know. If these are just current limitations, I would suggest expanding the possibilities accordingly.