Vanillamobs.yml
VillagerSpawn:
   Type: Villager
   Display: 'Villager'
   Health: 20
   Damage: 5
   Options:
     PreventRenaming: false
     HasTrades: true
     Despawn: true
   Drops:
   Skills:
   - skill{s=VillagerTransform} @trigger ~onInteract

Skills.yml
VillagerTransform:
  TargetConditions:
  - hascurrancy{a=1000}
  Skills:
  - currencytake{a=1000} @trigger
  - summon{type=Villager;a=1;r=1} @self
  - effect:particles{p=enchanting_table;a=100;hs=1;vs=3} @self
  - suicide ~oninteract @self
  - message{m="<mob.name><&co> This looks like a nice place to settle!"} @trigger