JoeZoo is a free Google Docs Add-on that teachers can use to add voice and text comments to a students’ paper. But that alone is not what makes it great. What makes JoeZoo stand out from the crowd is the built-in student engagement tracking capability. JoeZoo will let you see which text comments your students read, which voice comments they listened to, and how long they engaged with those comments!
https://www.freetech4teachers.com/2018/11/is-your-feedback-really-effective-this.html