Exploration map not working 1.19

I would like to add an exploration map trade to an existing villager using data merge, but nothing I have tried seems to work. If you have an answer of how to do that then it would be appreciated.

 

Instead, I merged a chest with a loot table tag, and in the loot table put the exploration map. The trade and loot table both work, but the map is a regular unused map instead of an exploration map?