I don't know if this helps you but the Mermaid plugin in JetBrains has an export feature which can save you a step. But I find Mermaid diagrams so limiting and

I don't know if this helps you but the Mermaid plugin in JetBrains has an export feature which can save you a step. But I find Mermaid diagrams so limiting and the syntax more immature than PlantUML so it's very rare that I bother The "in readmes" is a special case because the markdown rendering in both GitHub and GitLab support it without drama