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[Sam Price]

Yes
https://github.com/mermaid-js/mermaid-cli

There are command line tools so it can be integrated into pipelines.
Convert Mermaid mmd Diagram File To SVG

mmdc -i input.mmd -o output.svg

<https://github.com/mermaid-js/mermaid-cli#create-a-png-with-a-dark-theme-and-transparent-background>Create
A PNG With A Dark Theme And Transparent Background

mmdc -i input.mmd -o output.png -t dark -b transparent

You dont get much control though over how it places boxes.
But it does sequence diagrams.
Im using it for gantt charts.

Its one of the mainstream alternatives to plantuml
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