How to bundle and embed a dedicated worker which uses libraries in a web application?

I am trying to integrate workerpool with a Reactjs app (CRA) but am having quite a few different issues depending on how I try to achieve it. Using it with the Node part is no problem but I think more info is needed on the "browser" side of the repos.

By looking around I found https://github.com/josdejong/workerpool/issues/43 where Jos was kind enough to provide a basic example (https://codesandbox.io/s/xz9jwnyvrw). Issue is, in a real app you probably won't have a simple function placed in index.js that does not need any external librairies

1) How can I define a seperate worker using its own external librairies and use it in index.js? using `var pool = workerpool.pool('/path/to/worker.js')` then `pool.exec('function')` as suggested in another thread did not work

2) Can workerpool used for the browser only be integrated in the way described here https://github.com/josdejong/workerpool/blob/master/examples/browser?

I would appreciate a realistic example of integrating workerpool with a React app, maybe by updating the codesandbox to use an imported worker with its own librairies?