Posted by abelsromero on
URL: https://discuss.asciidoctor.org/CustomHTMLConverter-tp8088p8089.html

You don't need a full converter.
You could create a custom section template and add a class arround the number.

Here are some examples: https://github.com/asciidoctor/asciidoctor-backends/blob/master/slim/html5/section.html.slim. You can use several languages, and note the repo is for example and reference, and not all are 100% up to date.