How do I report the excess Roth-IRA contribution and recharacterization in TurboTax?
The 2020 code JP must be entered into your *2019* amended tax return.
For the recharacterization and conversion see my answer to tax17- in this thread:
https://ttlc.intuit.com/community/retirement/discussion/how-do-i-file-a-roth-recharacterization-to-a-traditional-ira-and-then-a-backdoor-roth-conversion-on/00/2004745