Automatic indexing for objects like in Sphinx

[juh <juh+org-mode@mailbox.org>]

Dear all,

I do some software documentation using Sphinx (https://www.sphinx-doc.org/).

When compiling pdfs Sphinx + LaTeX generates a huge index using a semi 
automatic mechanism.

You can eg. do this:

-----

This is my normal text. Now comes the description of a Python module.

.. py:module:: foo

    Description of module foo

This is normal text.
In the next sentence I want to reference the foo description.
Learn more about :py:mod:`foo`.

------

It is quite simple.
You mark something as a specific object and can reference it elsewhere.
Additionally Sphinx builds an index with links to all modules.

And the syntax is extensible, and you could define something like

.. mode:: org-mode

    Description of org-mode.

Late I can reference the description with :mode:`org-mode`.
And it will show up in my index.


I wonder how I could achieve this in org-mode.

The foo description in Sphinx is not a headline but an anchor-reference 
thing.

How could I achieve this in org-mode in a way that it gets exported 
correctly to be of use in Latex or HTML?

Can I make "foo" a subtree with a special tag that triggers the 
anchorization, referencing and indexing?

I know that there are tags and an index mechanism, but I miss the way 
how to chain it all together.

TIA
juh