You will need to complete a Form 709 to report the gift given. TurboTax does not support IRS Form 709.
The form is not included with nor sent with your federal tax return. It is sent separately to the IRS to the address noted in the Form 709 instructions.
Go to this IRS website for the Form 709 - https://www.irs.gov/forms-pubs/about-form-709
