Run Pixelmator ML Super Resolution on multiple images from terminal?

Have about 1000 images with the size of 480x320px, and they are very poor quality. I tried the Pixelmator ML Super Resolution to increase the quality (1440x960) and it seems to perform well! So I thought to iterate the 1000 files, from terminal, and change the format from jpg to HEIC. When I tried this, the HEIC file is 142K and the originl jpg is 400K. So a win win?? But how can I iterate the files, use ML Super Resolution, and save the file to a new HEIC format?