This reminds me of a certificate editor I did for a star up back when I was a intern during my college years.

The whole thing was to have custom certificates for several types of events, workshops and courses digitally signed. I was responsible for developing the editor.

I end up creating a "word art" online. You could add text, titles, images, backgrounds, some effects... You could export a PDF, image... All in vanilla JavaScript running on the browser. It was so much fun. It's a shame I don't have the final product to show.