My some models:

function getShape() {
  return {
    models: {
      shape: {
        paths: {
          side1: new makerjs.paths.Line([0, 0], [L, 0]),
          side2: new makerjs.paths.Line([200, 0], [50, H]),
          side3: new makerjs.paths.Line([50, H], [50, H]),
          side4: new makerjs.paths.Line([50, H], [0, 0]),
        },
      },
      text: {
        caption: new makerjs.models.Text(window.makerjs_font, `Some Text`, font_size);
      },
    },
  };
}

Without mirroring and rotation:

After mirroring:

What techniques are there to display text after mirroring as well as before mirroring?