a feature of Mermaid flowchat

[yu2chuan]

Is your feature request related to a problem? Please describe.
Mermaid can draw a timeline, pie chart, or mind map quickly. It will be useful to present data in several ways instead of only tables.

Describe the solution you'd like
That will be good if Markflowy can support this flowchart feature. But if this will increase the size too much, could it be an external plugin? If supporting plugin will change the framework too much, let's keep Markflowy tiny and ignore this idea.

Describe alternatives you've considered

Additional context

[drl990114]

This should be implemented in the plugin system, so before considering joining Mermaid, I need to implement the plugin system first, which may take some more time.