Once enabled Mermaid charts can be added to any FAQ using the Mermaid syntax and wrapping the code in a div with the mermaid class. Eg:
<div class="mermaid"></div>
Chart code can be added to any FAQ. E.g:
<div class="mermaid">
graph LR
A[Square Rect] -- Link text --> B((Circle))
A --> C(Round Rect)
B --> D{Rhombus}
C --> D
</div>
The code above renders the following chart:
More examples can be found on the Mermaid website here.
A live Mermaid editor can be used here: https://knsv.github.io/mermaid/live_editor/