The functionality of the CTA buttons seems to be pretty limited. You cannot overlay an image on to the button, such as an arrow, and you cannot increase the size of the button without adding more text. In my opinion the CTA buttons should have the same functionality as the 'Divider'. It would be great to have that kind of control of the height and width of the button.
Update 2/8/2022: We do not have updates to share as we are currently updating our templates. In the meantime, you can use a third party service to create more customized buttons like Clickminded.com to create a customized button and insert it as a clickable image.