Hi,
The SDK FlexIO drivers do not support PWM.
There are FlexIO drivers for emulated I2C, I2S, SPI, UART.
Please refer to the documentation in the SDK installation folder:
...\NXP\S32DS_ARM_v2018.R1\S32DS\S32SDK_S32K1xx_RTM_3.0.0\doc\Start_here.html
Regards,
Daniel