I can find no way to get to the form 4562, however (or, at least, no way to make changes on it in TT).
When you elect to edit that rental property, you're presented the "Review your [propertyname] Rental Summary" screen. The very last item on that screen is "Vehicle Expenses". Edit that.
Enter your odometer readings with 1 mile for business use. You're done.
You can't claim 0 miles of business use, because if you do, then you have to remove the vehicle from the business. Since you intend to claim mileage again in 2022, just enter 1 mile of business use and press on.
The Rental section of my return (in TT) doesn't have a section called "Vehicle Expenses".
Perhaps you're not seeing it on the rental summary screen because you need to scroll down?
I don't want to claim expenses this year, but I may want to claim the next.
It is for that reason you need to claim at least 1 mile of business use for 2021.
