NJ State Tax Reporting for Backdoor Roth IRA Conversion

When completing my New Jersey state tax return, I encountered a field labeled

• Contributions related to this distribution previously taxed by New Jersey. 

Could someone please clarify what I should enter in this field?

Context: I performed a backdoor Roth IRA conversion in 2023. In 2023, I contributed $6500 to a traditional IRA, which accrued $2 in interest by the time I converted the entire amount ($6502) to a Roth IRA. Should I include the full $6500 contribution amount, considering it was contributed to the traditional IRA or $6502 or some other field from my form 1099-R?

Any assistance with this matter would be greatly appreciated. Thank you in advance!