Hi @ClarisavdM5,
I don't think this is going to be possible to automate in Canvas. In Canvas, groupwork is generally considered to be a collaborative work where the group collectively has one submission. You could certainly set groups up for students to collaborate, but you'd then need to just set up a regular assignment (not a group one), and manually assign peer reviews for each student to be those of the others in their group. If you have a small class this might be doable without too much effort, but if you're looking at 50+ students it seems like it would be quite time consuming.
Hope this helps a bit, even though it might not be what you wanted to hear.
-Chris