My students will make a project with different topics, which the students should sign up for. Each topic should only be available for one student. Is there any way to solve this in Canvas.

In our previous system, I solved this by creating groups limited to 1 student per group, but in Canvas it seems I cannot limit the number of students in a group to less than 2. I understand that there is no real point in having groups of 1 student, but I also cannot see how this functionality would make any harm.