When using the only directive some needs may require to be excluded from the needs list, i.e. from needs.json, needtable, needpie ...

For example:

.. only:: tag1

  .. req:: requirement for tag1
       :id: req-001

       This one shall only appear when building tag1

.. req:: requirement for all tags
     :id: req-002

       This one shall always appear

in this case when I don't build tag1, I don't want req-001 to appear in needs.json or in needtable

Do you agree about the expected behaviour ?
Do you know if while processing the need level we are able to know that the element is under an "only" block ?

just for information, we found this interesting extension which can be inspiring: https://github.com/pfalcon/sphinx_selective_exclude