Best approach for generating SVG graphics with LLMs?

I had Gemini help me make a sparklines charting component that uses SVG. The SVG itself is relatively simple and is parameterized. So it's really only making an SVG component that gets data, rather than designing icons. I tried to get them to do that without any success. I stick to open source icon libraries and there happens to be a meta list on the front of HN right nowhttps://news.ycombinator.com/item?id=46665411