I am no expert in Figma. But I believe you can convert image to SVG and export on the figma page. See pic.

https://www.figma.com/file/HdlFOxW77gAADyRaOk1GUZ/Nostr-Website-Button-Logo?node-id=0-1&t=ZIFG1gI26kUNIsJ0-0