Customize the new card visual using a JSON Theme

[ralucaarba]

Hello,

I have a report that is using a custom theme. Is it possible to customize the new card visual through a theme ? I have tried using the 

"card" section for the JSON theme but it is only affecting the old card visual. 

Thank you !

[WE187]

I have the same issue. What is the textClass to use in the JSON ? I tried asking AI to get some info but it seems it hallucinated the results because none of its suggested textClasses work