/summon villager ~ ~2 ~ {VillagerData:{profession:librarian,level:5,type:plains},Offers:{Recipes:[
{buy:{id:oak_log,Count:16},buyB:{id:birch_log,Count:16},sell:{id:oak_log,Count:1,tag:
{display:{Name:"{\"text\":\"Wood Upgrade\",\"color\":\"dark_green\"}"}},maxUses:128}}]}}