Being able to leave comments on a particular page/slides (instead of general)

I would love to have a feature where I can comment on student work while they are working through the slides and be able to leave the comment on the individual slide itself, like a comment box of some kind. The communication feature is alright, but is to general.

Comments do specify the slide, and actually clicking on a comment takes you to that slide, but you do have to teach your kids how to use the feedback.