[рони]

добраться до значений ключей "age" и "rating"?

const data = {
  "Grace": {"age": 5,"rating": 2000},
  "Lily": {"age": 10,"rating": 1000},
  "Oscar": {"age": 15,"rating": 900}
}

for (let {age, rating} of Object.values(data)) {
  console.log(age, rating)
}