The datasheet say the corner frequency can be lower by the capacitor on FLT4 pin

I want to measure the frequency above 1 MHz, so the corner frequency should around 1MHz, so the using the expression

to calculate the capacitor CFLT4,

Is this calculation correct?

If you want to apply a carrier frequency of 1 MHz, you need to start by adjusting the cap values for FLT1, FLT2 and FLT3. Please review the equations in the apps section called "Operation below 1 GHz/Envelope Filtering".