Co-Pilot (whatever that is) says:
"As of early 2025, Turbo Tax has not yet made the updated Form 4684 available for filing. Users have reported messages indicating the form will be available after February 20, 2025. Turbo Tax is working on updating the form to reflect new IRS rules, but until then, users may face delays if they need to file using Form 4684."
So I guess I'm stuck, until then.