Deductions & credits

My wife has Lumbar Degenerative Disc Disease.  It has progressed and she no longer can use the stairs in our two story home.   Dr.Gossard has issued an Rx for an elevator.  I use Turbo Tax to complete my Fed taxes and want to include the elevator expense in the 2021 taxes.   I understand the rules but don't know what forms a will be needed to satisfy the IRS.