If you upload the entire contents of your exported Hype folder, you would essentially be hosting your entire document on that CDN. Here's instructions for that:
You could still fill in the external runtime URL in the Advanced Export panel, but it is not necessary. As long as your original 'generated' JS file is loaded from a server, all other assets will be able to use that same path.
Well, an 'external image' is only relative to where you are right now, eh? It's standard practice to host ads on CDNs, so go for it. Cloudfront is the faster version of AWS that you're using.