Ultra Low Power mode guide for RAK3272s

Hi guys, is there any guide I could refer to for programming ultra low power mode (1.69uA) on my RAK3272S using STM32 IDE?

Maybe this helps:
RAK3172 Low Level Development
But we have the guide only for the SDK V1.0.0 and V1.2.0

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I tried the PWR_STOP2_RTC from SDK 1.2.0 to try sleep modes. Is there any way to migrate this example code to STM32WLE5CCU6?