I am building a project with Sphinx and myst_parser. Looking into the documentation of MyST Markdown, I saw this is possible to have numbering headers:

https://mystmd.org/guide/cross-references

But including this in my file.md and compiling with the classic make html, the headers are not referenced by number.

I tested by adding these line in the live demo of myst-parser:

https://myst-parser.readthedocs.io/en/latest/live-preview.html

---
numbering:
  headings: true
---

Do I miss something ?

I would like to have the same as in the documentation of myst:

https://mystmd.org/guide/cross-references