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Re:Show HN: Crossnote – a note taking extension for VSCode by jbreiding on Sunday April 12, 2020 @04:03PM (#22850665)
Have you tried mermaid? I guess it really depends on the editor and viewer you are using.

I've used this mostly with vscode and rendering from gitlab/hub, https://marketplace.visualstudio.com/items?itemName=bierner.....

Re:Show HN: Crossnote – a note taking extension for VSCode by shmoogy on Sunday April 12, 2020 @08:20PM (#22852047)
Sick. Thank you for this.