Dragons the nine realms dlc

i know it's not httyd canon, but im just thinking that maybe have a dlc that allows us to explore the hidden world nine realms (rakke town, crystal, fire, ice, king, nature, giant, desert, dark and gods.) and do some (optional) missions, to help dragons or just go creative and do whatever. And yes underground, Im sure we can add light to the realms. And can forget about the dragonsite.