You can split gifts with your spouse.
See https://www.irs.gov/instructions/i709#en_US_2024_publink1000122719
I would recommend that you at least use a 709 software program or visit a local professional who can prepare the return for you. The instructions are obtuse in part and somewhat incomplete in part so there's a good chance you're going to have some difficulty with the process.
The link below is to 709 prep software (it's 50 bucks):
https://www.puritas-springs.com/product-category/federal
The links below are to a couple of (moderately helpful) Youtube videos.
https://www.youtube.com/watch?v=a5wJow5h-No
https://www.youtube.com/watch?v=5Z_28sVOrTY
Good luck.
[The reason TurboTax doesn't include Form 709 is likely the same reason they don't include Form 706; they are gift tax and estate tax returns, respectively, not income tax returns]
