Same problem. Took $100k IRA distribution, $20k was converted to Roth IRA, rest was cashed out, 1/3 taxed in 2020, according to the CARES Act .
My version of TurboTax has some kind of error filling 1099R info, effectively not allowing to enter Roth conversion amount.
After multiple attempts I decided to treat the whole distribution as cash out, not mentioning Roth, cause it's how it is treated for the tax purposes.
