The value is not falling in the backend tables for Extra Withholding column in calculation card.

There is a requirement to fetch Federal Tax form details from My Workforce > Payroll > Calculation Card > Tax Withholding.
In this section, there is a specific column named “Extra Withholding.” The value for Extra Withholding is correctly displayed on the frontend UI; however, when checking the backend payroll and calculation card tables, this value is not being populated.
Assistance is needed to identify the correct backend tables (and columns) where the Extra Withholding value should be stored or retrieved from.