@Bendora You can just use the template provided and add what ever you need. Like the delayed load intent. Respect that you haven’t been using an export script until now. The script provided and the sample script on GitHub have the function to inject code at certain spots in the HTML. As an alternative you can also use Hype Template Genie to replace your default template if you only build banners.
An export script is a bit more complicated but also more powerful. BTW you can also move the def (Python function) used in the example provided by @jonathan to replace portions of the HTML into the modify stage to use local variables without worrying about local scopes in Python as they can get involved. Also, it is all about the correct indentation levels with Python, so use a good text editor.
Also, if you launch Hype using Terminal you can get really easy debugging feedback over Standard Out (stdout, hence the terminal itself)…