Send headers with Vue-Router

I already searched for a good while on the Internet and even checked all suggested questions here, but I found nothing.

Basically, I'm using vue-router to load views when the user clicks on them (without prefetching, just lazy-loading), using a function that imports the Vue view/component. To better visualize, I made a barebone example of what I'm doing:

const router = new VueRouter({
  routes: [
    ...
    {
      path: "/a_page",
      component: function() {
        return import("./views/A_Page.vue");
      }
    }
  ]
});

I'm using Express in the backend to protect certain routes, because protecting it in the Frontend is wasted effort, since the user could bypass the 'protection' easily, if he wants to. Also all views have their own splitted .js file (using "webpackChunkName") and Express needs a Bearer Authentication Token header for every API call OR .js file requested. This works great with Axios (responsible for fetching API data) where you can manually define a header, but vue-router hasn't this option, and since it doesn't send the Authorization header, it doesn't authenticate, Express blocks the file with a 403 and vue-router fails to import the file.

Is there any way to send the Authorization header with the import (which is basically just a GET request)?

Thanks in advance.

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If someone thinks I'm approaching the problem in a wrong way, feel free to comment and suggest another way.

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EDIT: The suggested duplicate question was given too little attention and the only solution given (which is basically split in 2) doesn't work with the current webpack anymore; onload(event) and onerror(event) get undefined.

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