Hi @StephenYeh,
Unfortunately, there aren't examples for the RTC in the current RTD version but, there is a RTC example build for the S32k344 RTD 0.9.0 that you can use to as base of how to setup the RTC.
https://community.nxp.com/t5/S32K/S32k344-Rtc-wake-up/m-p/1320257
Best Regards and Happy Coding!