You continue not getting it. That's an unnecessary overhead. Strictly speaking, you don't need it. If you can get away with not including it then you absolutely should skip it.
You guys can take some lessons from the so called static site generators. They have the right idea. Also Svelte which kind of does something very similar (although it does compile things to more vanilla JS which I like because less frameworks and inclusions).
Why not have your framework find standard .html files in a well-known location and wrap them in the boilerplate for me?
That way, I don't even need to think of them as something else - they are just HTML - and the magic is happening with me even seeing the wand