(I started typing this before Dark Dimension's reply)
I don't think there's a direct way to do this. An indirect way would be to have an in-browser "demo" that can turn into the full version if the player drags and drops a certain file, or enters a code, and then you make that file/code part of the download.
Another way to get around the local webserver problem is to package the game into an app using something like Electron. You usually barely have to modify your existing Javascript at all for that.