flowchart-fun

With npx:

npx flowchart-fun -i <textfile_path> -o <svg_path>

Example:

npx flowchart-fun -i mycharttext -o chart.svg

To use programmatically

const { generate } = require("flowchart-fun");

const text = `
this
  is: a
      pretty cool: chart
`;

generate({
  text,
  outputPath: "chart.svg",
});