You can totally do this in different ways. Either directly from within ChatGPT as @salb99’s has done in the past or using a service like Apple Shortcuts to bring it all together like @Iamjmw has done with Apple Shortcut Quick Note with ChatGPT Generated Title.
While a Supernotes API key currently grants access to all API endpoints, you can build the integration to only be able to create cards and not read cards / your data.