Can I deduct car payments on a modified van we purchased in a previous year?

Good afternoon,

We purchased an wheelchair accessible van in 2020, but did not deduct it from our taxes at that time because we did not think of it. We don't want to try to go back and amend our 2020 return (if that's even possible).

 

Are we allowed to calculate the portion of the van's price that accounted for the modifications and deduct that percentage of our car payments from our 2022 taxes?