access object value in the same object in javascript

Question

I'd like to access the object value in the same object and use it, is this possible? If not, what else could I do to make something like this work?

  const languages = [
      {
        langCode: "cs",
        countryCode: getCountryInfoByLanguage(this.langCode).countryCode,
        language: LanguageValueToName(this.langCode)
      },