Right now, in case you user detected any Code of Conduct violation, they would be able to report it and then write down why they think it is against CoC. I would like recommend to add category , so people would be able to know when to file a report and in long term it is easier for moderators to do data mining like how many of reported contains was in each category and easier to decision making. I would recommend the following categories:
In such a case, it is not only about abuse contents but it is a way to help moderators to make decisions. So it could be like report to moderator.