JSFiddle - React, Tailwind, and code Playground

HTML

<select id="my_languages"></select>

JavaScript

languages = {
"aa":{"iso639-2T":"aar","family":"Afro-Asiatic","labels":{"language_names":["Afar"],"native_names":["Afaraf"]}},
"ab":{"iso639-2T":"abk","family":"Northwest Caucasian","labels":{"language_names":["Abkhaz"],"native_names":["\u0430\u04a7\u0441\u0443\u0430"]}},
"af":{"iso639-2T":"afr","family":"Indo-European","labels":{"language_names":["Afrikaans"],"native_names":["Afrikaans"]}}}
    
var $select = $('#my_languages');
for (var lang in languages)
  $select.append('<option value="'+lang+'">' + languages[lang].labels.language_names[0] + '</option>');