Comment on reports

Yep, you can do that too.

How to comment on a report:

Use the shortcut C to add a comment to a canvas.

Who can add a comment?

Any Count editors, viewers, or guests can add a comment to a Report they have view access to.
An anonymous viewer of a public report cannot add comments.

What about other canvas comments?

Comments made outside of the report frames are not visible in reports, but remain visible in the canvas.