The OBI 202 can implement QOS for anything that passes through it, at least in theory. Few do that, as far as I can tell. You can search for QOS and OBi202 on this forum, but I don't think you are going to find the definitive info you want. I cannot try it, because my modem has its own router that does not have a bridge mode.
I would also search for your router along with the term QOS in a search engine. Maybe your router can do QOS or maybe you can get firmware which will do so.