Chatgpt generates markdown output by default, which supports titles, bold text … Etc but doesn’t support colored text. I would try to ask to generate html. It would not be supported by its client, you would have to open the file in a browser.

Have you asked it to use different fonts ?

You might want to look at using codex or opencode with ChatGPT.

It’s not immediately clear if you’re just trying to get a better user experience for yourself or you’re trying to get the llm to output it with some style.

What prompt(s) are you giving it?