Posted by abelsromero on Feb 09, 2021; 2:27pm
URL: https://discuss.asciidoctor.org/GitHub-or-similar-for-asciidoc-publishing-tp8483p8484.html

Third-patform support is not really on the Asciidoctor team hands. Collaboration is there, but at the end is up to each platform to decide what features to support.

Said that, GitLab has been more open and does support includes and some diagrams https://docs.gitlab.com/ee/user/asciidoc.html.
On GitHub you will need to resort to preprocessing files (embedding with scripts) and Kroki for diagrams https://kroki.io/.