Any plan support **mermaid** language code block ?

[TinyZzh]

Is your feature request related to a problem? Please describe.

mermaid

It is a Javascript based diagramming and charting tool that renders Markdown-inspired text definitions to create and modify diagrams dynamically.

Describe the solution you'd like

support rander mermaid language code block.

flowchart TD
    A[Start] --> B{Is it?};
    B -- Yes --> C[OK];
    C --> D[Rethink];
    D --> B;
    B -- No ----> E[End];

e.g.

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