Using Custom Image Generation APIs Like Supermeme.ai for Meme Presentation Slides

Hi! I was wondering if it's possible to create images from a custom source outside of the options listed below? The custom source could be a different image gen API assuming we have control over what text is passed to those APIs as well Here's my use case - I want to generate meme presentation slides and I want to use Supermeme.ai API to generate the images and not the default image options.