Not even close to as complicated as a router that can actually have any ability to do this.
Short answer is this router can not accomplish what you need so you can stop here if you have no plans to buy a different device.
To even think to do this you need a router that has a much more advanced form of QoS. Look at the latest tplink or asus manuals for examples.
Still even these the vast majority of feature are window dressing that are completely removed by the ISP even you manage to mark packets.
The only feature that has value is the ability to place a hard bit/sec limit on traffic based on IP address or other methods. Even routers that have this ability most can only do it on traffic being SENT..ie upload. The vast majority...