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I have a perfectly working  modularized Javascript app which uses ES6 imports and exports. For that app I used webpack to create a single Javascript file with all the resources (like css, js, ...). The app uses some thirdparty libraries and I used npm to install and webpack to bundle them.
To make the JS app available to HTML pages I simply store an object on the global window. Like window.myapp = app. Works like a charm!
Now I want to make a portlet for Liferay 7.2.1 out of my app. I read a lot of information like
https://portal.liferay.dev/docs/7-1/tutorials/-/knowledge_base/t/using-external-javascript-libraries
https://github.com/liferay/liferay-js-toolkit/wiki/How-to-use-liferay-npm-bundler
https://portal.liferay.dev/docs/7-0/tutorials/-/knowledge_base/t/liferay-npm-bundler
and decided to give liferay-npm-bundler a try.
My (default) portlet project structur is like:
...
|_resources
  |_ src
    |_ js
      |_ xy.js
    |_css
      |_xy.css
|_ package.json
Here's my npm-bundler configuration

{
  "sources": ["src"],
  "create-jar": true,
  "output": "build",
  "rules": [
    {
      "test": "\\.js$",
      "exclude": "node_modules",
      "use": [
        {
          "loader": "babel-loader",
          "options": {
            "presets": ["env"]
          }
        }
      ]
    }
  ]
}

Results when I run npm lifery-npm-bundler:
1. There's a lot of output like mylib$jquery@3.4.1 in the build diretory. Which is funny, because the dependency is not defined in package.json. I guess it's required by one of the external libraries. QUESTION: How to avoid that? I know that Liferay already provides JQuery and don't need it in the generated bundle.
2. I configured "create-jar: true" but no OSGI Bundle jar is created in the build directory. I would like to deploy this jar to Liferay portal to publish my portlet.
3. Even if the OSGI Bundle would have been created... How do I use my app in the view.jsp? How to make a specific module (from the resulting bundle) globaly available so that my HTML can trigger the Javascript?
I'm stuck and hope that somebody has some advice :-)