Maybe there's a bundler/webpack plugin that supports deno's import system, so it just fetches whatever http urls/analyzes the import maps and turns it into a normal web bundle.
Deno’s import system is just the ecmascript import system. So, it works exactly the same way it does in the browser. Or with curl. Or whatever. You just supply a uri and get the resource at that location. Things like import maps are just a way to make that more convenient during development, but there’s no secret system for pulling these pieces together; it’s just the ecmascript module standard (that didn’t exist until more recently).
