I write my .pdfs in a stand-alone markdown editor which supports mermaid, so your use-case is what I experience when doing graphs in writing. This way, there's

I write my .pdfs in a stand-alone markdown editor which supports mermaid, so your use-case is what I experience when doing graphs in writing. This way, there's no need to separately generate an image output to include into the document later on. Different "tools". That said, I'd love a dedicated application for diagraming, with exports to various formats for other use-cases.