How can I use the RTC in RAK4631?

I am using a RAK4631 WisBlock Core. It is running RUI3 with firmware version 4.1.0. I am using Windows 11.

I want to work with the internal RTC of the nrf52840, but RUI3 does not provide any example to do this. can you help me? If you can share info with me, I really appreciate it. I saw in the documentation that the NRF52 on RAK4631 has the quartz crystal (X2 = 32.768 kHz).



The RTC is used by RUI3 itself and is not available for applications (as far as I know).