Voh and Vol value in S32K142 Microcontroller
Voh and Vol are provided, just look at the datasheet for GPIO DC specifications.
They are just based on the pin drive strength and at the rated current for that pin strength. At the rated current the drop is 0.8V. With less current, the drop is less. With no or very low DC load, the drop is almost nothing, 0V.
Since the LED driver is a high impedance input, it draws almost no current. If the MCU GPIO supply voltage is for example 3.3V, it can easily output 0V and 3.3V to the LED driver pin. There is no compatibility issues.
All microcontrollers and other chips with CMOS outputs have some voltage drop due to the output impedance of the output driver, nothing unusual going on here. For example another MCU could be rated to have 1V voltage drop at 20mA, which equates to output impedance of about 50 ohms.