How do I enter nondeductible ira contributions for 2019 that were not reported on form 8606 because I made those after filing?

With the extension til July for contributing I decided last year to go back and max out my 2019 after tax IRA contributes and convert that to a roth IRA.  I had originally contributed 1500 nondeductible to my IRA and rolled that into a RothIRA during the 2019 year and that is reported on my 8606 form for 2019.  After filing with turbotax in early 2020,  I contributed this additional 5500 (for a total of 7000) to the IRA and also converted that to my roth IRA.   Now how do I register that w/ the IRS - refile 8606 stand-alone with the new totals? I don't need to amend my 1040 for just amending this form or do I?
How do i tell turbo tax the 5500 on my 2020 1099-R was from 2019 nondeductible contribution or update that info in my turbotax history so it doesn't tax that 5500 as it is doing now?