Wyvern Lair found up in mountain biomes

With one of the themes of 1.20 being story telling I think its important for us as players to be able to go on memorable, unique adventures to exciting locations. And what is more exciting then going on a quest to slay a dragon/wyvern First of all I believe it would be cool if either the wandering trader/the cartographer sold a map to this wyvern lair (or an entirely new Villager) This rare structure would be found High up inside mountain biomes and inside would be a wyvern or two which would be protecting a few chests filled with loot I think the wyvern mob could provide a unique and memorable combat encounter and also possibly some cool crafting recipes. Although this idea isn't fully thought out and is quite a lot to ask for I do believe it would be an awesome feature that would inspire stories within our worlds