Hello ThorV,
Thank you for using the NXP community.
Unfortunately I do not have a sample code, in this case, you can perform simple a reading/writing procedures via I2C (chapter 14.9.11 from datasheet).
After turning on the device, you can use I2C to modify the functional registers and change the output voltage of the internal regulator. However, please note that if you perform a power-on reset, the device will revert back to its default values (chapter 17 from datasheet). This means that you will not be able to permanently program the device using I2C.
I hope this information will be useful for you.
Regards,
David