/summon villager ~ ~2 ~ {VillagerData:{profession:librarian,level:5,type:plains},Offers:{Recipes:[
{buy:{id:stone,Count:12},buyB:{id:polished_andesite,Count:3},sell:{id:stone,Count:1,tag:
{display:{Name:"{\"text\":\"Stone Upgrade\",\"color\":\"gray\"}"}},maxUses:128}}]}}