I can’t get a variable out of a function

Question

I’m trying to make a currency converter, but I can’t get the object out of the fetch, although I read this question don’t understand yet what I should do, I am obliged to make the conversion within the then? even using an asynchronous function, how do I use "dataFinal" out of the?

const pegaDados = () => {
  let url = `https://economia.awesomeapi.com.br/json/all/${moedaFinal.value}-BRL`;
  let dadosFinais;

  if (moedaInicial.value != "R$") {
    url = url + `,${moedaInicial.value}-BRL`;
  }

  fetch(url)
    .then((response) => response.json())
    .then((dados) => {
      dadosFinais = Object.assign(dados);
    });

  console.log(dadosFinais);

};