I believe that the workaround to do this is to enter $1 on box 10 on your W-2. This will cause TurboTax to show you some additional screens including the one that asks you how much carry over you had from 2020.
And when you look at the 2441, you will see that the $1 will make almost no difference.
NOTE: this may cause the IRS to (someday) send you a letter asking why you altered your W-2 upon entry (the IRS gets a copy from your employer). If so, just explain that you did this as a workaround to get the tax software to accept your dependent care carryover.
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