It would be great if, with Shadowlands data, we could see some additional data added to the /data/wow/mythic-keystone/dungeon/{dungeonId} endpoint. Specifically, I would like to see a list of possible items to be contained in the chest, or a set of entries added to the /data/wow/journal-encounter/{journalEncounterId} that refer to the Mythic+ as a single encounter, with the loot contained there.
With the wild differences between standard Mythic and Mythic+ loot tables, it would vastly simplify understanding of the things available in the two different difficulties.