jsdoc include/add additional static files/pages like html/markdown

Question

I know there is way to copy static files via jsdoc, for images as example. Is there a way to "extend" the generated template via markdown or html files that integrate into the "look & feel" of the used theme?

I know you can include one markdown file as "landing page", but i wonder if its possible to add more pages/files.

Why im asking this?

Because i want to generate the documentation out of my source code and add then some additional pages which describe the workflow of my application or the behavior of some components.

Doing this in a single markdown document & that as "landing page" seems not a good solution.

I cant imagine that there exist not a "read to use" solution.

I just want a nice & complete documentation of my application which includes stuff from the source code and additional pages.

Any hint is welcome. Thanks in Advance.