I don't have the answer to your question, but if you are trying to do year-end planning by estimating the entries on a 2020 tax return, you can presently make Form 1099-R entries in forms mode of the CD/download version of 2020 TurboTax. You can later do your real tax return when the retirement and social security section is activated. With the exception of Form 8915-E for reporting Coronavirus-Related Distributions, TurboTax appears to do all of the necessary calculations on the relevant forms. (If you need to report a CRD, you can simulate it by reporting it on Form 8915-D as long as your 2019 disaster distributions, if any, plus your CRD do not exceed $100,000.)
When making Form 1099-R entries, be sure not to indicate that any distributions you received were RMDs; RMDs were waived for 2020 by the CARES Act.
