Currently there are no options to format Cart Title and Description text. Potential use-cases for text formatting include:
(1) to call attention to Smart Text values
(2) to use title text as chart color legends (ex. see the "1. integrated text" example on this page:
https://www.flerlagetwins.com/2019/06/legends.html
)
Desired formatting options are to be able to use Bold, Italic and Underline options; change the font size; and change the font color.