The C&J is really a full body lift, but it’s mainly a lower body lift. The use of the shoulders and upper back is mainly in an isometric capacity to fix the bar overhead, and there is some use of the lats to draw the bar in after it passes the knees.
Why do you want to incorporate C&J?
Keep the reps low - no more than 3, 6-8 sets. Any more than that and you’ll either start making bad technical errors because you get tired, or if you don’t get tired the weight is far too light. Doubles in the C&J should have you gasping.