Allow Developers to Inject Html

Allow Developers to either inject HTML into the head or body of the index.html, When working with web games, Proper meta descriptions are 100% required for SEO and it becomes a pain to need to manually edit the index.html file after every build

That do would be an useful feature. In the meantime you can use my custom command line exporter gdexport, it supports plugins and injecting HTML is trivial with those. It also has a plugin to add a workbox service worker or to generate a WebManifest from project properties and icons.