How to use the jimp.loadFont function in jimp

new Jimp(128, 128, function(err, spriteImage) {
        Jimp.loadFont(path.join(__dirname, 'font.fnt')).then(function(font) {
            spriteImage.rgba(false);
            spriteImage.background(Jimp.rgbaToInt(0, 0, 0, 255));

            var spriteDuplicateMap = {}
            // Do an initial loop through our sprites to find ones with the same id + palette, so we can mark them.
            for (var i = 0; i < parsedSpriteData.length; i++) {
                var lookupId = parsedSpriteData[i].tileId + '_' + parsedSpriteData[i].palette;
                if (!spriteDuplicateMap[lookupId]) {
                    spriteDuplicateMap[lookupId] = {totalCount: 1, thisCount: 0};
                } else {
                    spriteDuplicateMap[lookupId].totalCount++;
                }
            }

            // Okay, we're going to compose this image of sprites until we run out. 
            // All are 16x16, and we want to tile left to right, top to bottom

async function createCover() {

    // load font and our base cover image
    // we put subreddit into this image
    const font = await Jimp.loadFont(Jimp.FONT_SANS_64_BLACK);
    const image = await Jimp.read("./cover/Reddit2Ebook.jpg");

    await image.print(
        font,
        0, // x
        600, // y
        {
            text: subreddit,
            alignmentX: Jimp.HORIZONTAL_ALIGN_CENTER,
            alignmentY: Jimp.VERTICAL_ALIGN_MIDDLE
        },
        782, // maxWidth (use same width as base cover image to center correctly)
        200  // maxHeight
    )
      .quality(80) // set JPEG quality. We don't need very high quality output.
      .write("./cover/cover.jpg");

var image = new Jimp(400, 300, function (err, image) {
		image.rgba(false);
		console.log("generating image");
		
		
		//Jimp.loadFont(Jimp.FONT_SANS_128_BLACK, function (err, font) {
		var fontPath = path.join(__dirname, "font-hel.fnt");
		Jimp.loadFont(fontPath, function (err, font) {
			image.print(font, 20, 100, time_string); 
			image.getBase64( Jimp.MIME_PNG, function (err, base64) {
					console.log(err);
					console.log(base64);
					resolve({ "message": "created text", "base64_data": base64 });
				});			
		});
	})

const writeText = async (
  image,
  { text, font, color, size, style, x, y, xBounds, yBounds }
) => {
  const filename = [font, color, style, size].join("_");
  const fontFile = await Jimp.loadFont(
    path.join(__dirname, `fonts/${filename}.fnt`)
  );
  return image.print(fontFile, x, y, { text }, xBounds, yBounds);
};