how to make nested table with group column using ant design

I have made nested table and its work but how about if we make nested table with group column.

            |   A1          |   A2          |   A3          |
            |A11    |A12    |A21    |A22    |A31    |A32    |   
B1               
    B11
        B111    
        B112
B2  
    B12 
        B121    

here is example for two nested table that i take from antd documentation .
https://codesandbox.io/p/sandbox/mwhyzc

any help will be usefull. Thank you