How to create a reports subpanel?

I want to create a reports subpanel with a relationship to target lists so that I can just add reports to a target list and set a schedulers to dynamically update the list from the linked reports.  I know this question has been asked many times but I can't find the answer anywhere. 

You can't see the reports module in studio so I tried to create the relation/subpanel by code but reports module is not sidecar yet so it doesn't seem to have the subpanel view.  I think I need to create this but it's not working for me. Has anyone done it yet and can you share code or tell me what files to create/edit?