It is nice have support for mermaid however not all my diagram types are yet supported by mermaid.
We tend to use asciidoc for most documentation and use PlanUML to express our diagrams.

Is it possible to support PlantUML ? I know other editors like Joplin have plugins to support this.

Thanks for the feedback!

PlantUML is unlikely to be added at this time, as it’s an external dependency that can’t be as easily bundled up with the editor.

I’d like to support some kind of external rendering tools at some point, so support may be added in the future, but there’s no time frame for that task.