TPS53688: How to make a power off sequence for two power rails

Hi team,

I have a question on how to make a power off sequence for two power rails, pls help confirm a effective way.

power rails: 12Vin  >> 3V3 & 1V8

solution: TPS53688 + CSD95410

current state: when 12Vin power off, 3V3 & 1V8 power off almost at the same time

new requirement: when 12Vin power off, 3V3 should be power off before 1V8 (x ms)

I have tried to adjust UV of the two power rails and Toff_delay, but it did not work.