You don't deduct it or report it anywhere on your tax return since it is not alimony. A QDRO settlement (an allocation of your retirement due to divorce settlement) is a property transfer to you and is not deducted on your tax return, nor reported.
Had it been specifically defined as alimony in the divorce, you would have been able to deduct it as such. As it is now, it is not deductible nor reported by you. It will be taxable on your ex-spouse's tax return as income.
