font = new Promise((resolve, reject) => {
    opentype.load(viewer.fonts.g_d0_f1.base64, (err, font) => {
        if(err) return reject(err);

        resolve(font);
    });
});

path = font.getPath(Object.values(viewer.pages[1].fabricText)[0][0][0].character, 5, 5, 72);
canvas = document.createElement('canvas');
document.body.append(canvas);
ctx = canvas.getContext('2d');
path.draw(ctx)
window.open(URL.createObjectURL(await fetch(canvas.toDataURL()).then(res => res.blob())));