Limit of Roth SEP IRA or solo 401k contribution

Starting in Jan 2023, SEP IRA can be roth, but I can't find anywhere on the limit of it. Roth SEP IRA can still be 25% of the net business profit, just like the traditional SEP IRA?

 

If I have two businesses, and one of business is not earned income (not eligible to contribute to SEP IRA), how to enter the Roth SEP in Turbotax?

 

Thank you!