[{_id:ObjectId("60a8f82df06d8601849b2a01"),"pokemon":[{"id":1,"num":1,"name":"bulbasaur","img":"img.com","type":["grass","poison"],"height":112,"weight":33},{"id":2,"num":2,"name":"char","img":"img.com","type":["grass","poison"],"height":112,"weight":33}]},]

db.collection.find({"pokemon.0.name":"bulbasaur"},{_id:0,"names":{$map:{input:"$pokemon",in:"$$this.name"}}})