If you can itemize deductions, which many married couples need no longer do because the total standard deduction is $24,000 for a married couple, you can deduct the portion of your annual dues that is for property taxes (called "ad valorem" taxes in Florida and your applicable documents). The annual dues bill provided in late December 2020 for 2021 dues also provides the actual property taxes you paid in 2020 and is the document that can be used to prove your deduction.
If there is a mortgage loan on the timeshare, and you can itemize deductions, you can also deduct the interest on the timeshare loan with some exceptions, the main one being that you can deduct interest only for one home you live in plus one vacation home.