They have a known system that can go from specified coordinates to images in the form of puppeteer (chromium) and so they can run it on lots of websites to gene

They have a known system that can go from specified coordinates to images in the form of puppeteer (chromium) and so they can run it on lots of websites to generate [coordinates, output image] pairs to use for training data. In general, if you have a transform and input data, you can use it to train a model to learn the reverse transform.