A new way to find slime chunks with the help of the cartographer villager

It's quite difficult to locate slime chunks without the help of mods and F3 screen.

To help the player located a slime chunk we could add a new trade to the cartographer villager.

The player will need a map of a specific area, completely explored and not locked. Then he will trade this map and few emeralds in exchange the cartographer will mark all the slime chunks on the map.