[1.14.4] Adding villager trades

[PlayerEater]

Is there any way to add villager trades?  In 1.12.2 you could just add a trade to one of the professions that were in the registry but it seems like it isn't possible anymore. Does anybody know if it is possible to do it in a simple way?

[Choonster]

It looks like the possible trades for each level of each profession are stored in VillagerTrades.field_221239_a (may have a deobfuscated name in newer mappings). The trades for each level are stored in an array, so you can probably create a new array with the both existing trades and your new trades and then replace the existing array in the profession's Int2ObjectMap.