Dynamically change text from JS file

[Akunin94]

My app init after some async changes (my main.js):
(async function () { try { let response = await fetch('/config.json'); let config = await response.json(); window.appConfig = config; appInit(); } catch (error) { alert('appConfig not found!') window.stop(); } })();

and inside appInit() i use
new Vue({ el: '#app', render: h => h(App), router, i18n, store })
But i have some texts inside .js file and now i use like this:

export default { super_name: 'Super name' }

My question: how can i use inside .js file dynamic $i18n texts? I can't export new Vue, because it is inside function appInit()