Yes, you'll need to amend to claim a mortgage interest deduction.
But, unless all of your itemized deductions, including mortgage interest, add up to more than your standard deduction, you won't get a tax benefit, and in that case you wouldn't need to amend your return.
Please see the TurboTax Help article “What's my standard deduction?” to see what your standard deduction is this year.
For more information that might help with your decision, please see the TurboTax Help articles below.
[Edited 03|18|2020 2:12 pm]