If you have Part C premiums paid from the SSA-1099 benefits shown in box 3 of the SSA-1099 and enter those premiums in the SSA-1099 section of the program, they will automatically be included as a medical expense to be reported as an itemized deduction on Schedule A.
However, if you paid the Part C premiums with out of pocket funds (Medicare Advantage, through an insurance company) then you enter the total premiums paid in 2024 in the Medical Expense section of the program.