Google Classroom integration

Currently EdPuzzle has the capability to assign something and when the student completes it, the grade automatically is recorded in Google Classroom.  There is no need for me to input any grades.

I am a frequent assigner of Khan Academy exercises, and I would LOVE for Khan to have this same feature.   This would be my number one suggestion, as it is tedious to manually input all those scores into Google Classroom. 

Thanks!