This is a basic example of how to imitate Ideogram's "magic prompt" with Gemini Flash.

It's possible with other models, but google offers a free API (link in the workflow). Simply load the workflow in ComfyUI, go to "Install Missing Custom Nodes" in the ComfyUI Manager and you're set.

There is a link to get an API key from google. You can also use this to caption images if you enable vision.