Sched A safe harbor for charitable contributions in xchange for tax credit

Per IRS 2020 Instructions for Schedule A:  https://www.irs.gov/instructions/i1040sca/

1.  If you made a charitable contribution in exchange for a state or local tax credit your charitable contribution deduction must be reduced as a result of receiving or expecting to receive the tax credit.

2.  There is a Safe Harbor rule that says that under certain conditions you may include this tax credit back on Sched A, line 5a, 5b or 5c, whichever is appropriate.  https://www.irs.gov/irb/2019-27_IRB#NOT-2019-12

 

How do I get this entered in TurboTax?

1.  The non-deductibility of the tax credit portion of the donation is not noted anywhere, I had to find out via other means.

2.  I can't see how to force my tax credit amount back in so it shows up in Sched A line 5a.  Seems like it should on the State Tax Ded Worksheet, line 17, but I can't edit that line directly even though it's blue.  I also tried calling it an "Estimated Tax Payment", but that # isn't being brought forward.

 

Thanks for any help.