As a quick fix, you can manually add those lines to the built HTML output. This is how I’ve dealt with such things in the past, but those were short-term projects, so a quick fix was fine.
Perhaps a macro is a more long term solution, but that’s something I’ve yet to get my head around.
If you don’t need anything in those lines to be dynamic, you could create a custom index.html to be used in your assets. You would need to add this to your project.xml: