You would have to use an advanced theme for that. You could override the main() function in your theme. In your version check which page is being requested via $this->template - if it's '' then output your extra HTML. Be sure to call the base main function at the end of yours via qa_html_theme_base:main();
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
April 20, 2021: Q2A 1.8.6 released!