I am not familiar with the field, but if there isn't a way to have LLM's generate graphics as editable InDesign or Illustrator files (maybe something Adobe will sell you?), I am sure there will be soon.

This is a problem which is entirely solvable by existing and new design/production apps. Instead of working entirely with raster image agents should programmatically edit the target file format.

You could try having, say Astra, use one of these programs via computer use to design it. I haven't tried it, but I hear it is really good at computer use. Might even have more of a dialogue as it creates, so dictating choices at each stage. Would take longer, but does not require someone who has expertise in the tool, just good design notion.

It can probably ransform most to html.

Wait 6 months...