On the form 1099-R that you will receive next year, it will indicate that the earnings are taxable in 2021, since that is when they were earned. So, you will have to amend your 2021 return to add that income on the tax return you are preparing now. If you add it now, you won't need to amend it next year, so that will be less trouble for you.
When you go to enter the substitute 1099-R, you will choose the option I'll type it in myself on the screen that says Let Us Enter Your 1099-R. When you see the screen that says Tell Us Which 1099-R You Have, there is an option on the bottom of that screen that says I need to prepare a substitute 1099-R.
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