No, there is no form. Your DCFSA contributions are in a box on the W-2. Then you will need to compile receipts with tax-id numbers for all eligible spending. Your DCFSA account holder, and any forms you used to get reimbursement from them are, as far as I can tell, irrelevant. You need actual receipts from the providers of care with Tax-id numbers.
There's no separate form to put the spending on, and there's no 1099-type form that shows you paid it. You would only need those receipts if you get audited.