Creator of Mermaid and CTO of Mermaid Chart. We have released Timeline diagrams recently https://mermaid.js.org/syntax/timeline.html we also added https://mermaid.js.org/syntax/mindmap.html

Both are still experimental, (in beta), but the syntax is set. Personally I really like using Mind maps when taking meeting notes.

Thank you. I was using the mermaid live editor and did not find it compatible with timeline. Which is why I inquired the status.