secure act 2.0 new Roth Employer (non-elective) contributions

I suspect you can't do that in TT because it is a law provision that is not effective until 2023. 

The employer contribution to the designated Roth account is not deductible, so it would not go anywhere on your tax return.  The only issue is determining the permissible employer Roth contribution, which you could do in TurboTax by initially indicating it to be a traditional 401(k) employer contribution to determine the permissible amount, then removing the employer contribution from TurboTax.