Add support for other file generation in MarkBind sites, e.g. JSON endpoint

[gerteck]

Please confirm that you have searched existing issues in the repo

Yes, I have searched the existing issues

Any related issues?

No response

What is the area that this feature belongs to?

No response

Is your feature request related to a problem? Please describe.

Is it possible to produce a json file using MarkBind, an example of a fake json file (here)https://git-mastery.github.io/exercises-directory/json.html, but it is still an html file. The outcome is to produce a proper json file. Is that possible?

The commit for the above page is here (ignore the change in index.md)

Being able to produce a json endpoint based on a .md file (in order to support variables usage) -> so that a page.

From nunjucks array to a json endpoint

If not possible, keep it as a json file, but if it is usable to use the nunjucks

Describe the solution you'd like

--

Describe alternatives you've considered

No response

Additional context

No response

[gerteck]

Check functionality for direct json usage, currently direct usage through a json file is possible, but the rationale is to use it with nunjucks variables.

https://markbind.org/siteData.json

[gerteck]

Closed by #2762