Add computed property to Route.Extend in Ember

So I have a main.js file which is a route:

import user from 'config/user';
import { computed } from '@ember/object';

export default Route.extend(SomeMixin, {
    firstName: computed(function () {
       return user.firstName;
    },
}),

in my hbs file I have

firstName is always empty in my hbs file. Is it possible to add a computed function to a route?