Increase light temp/kelvin

Hi is their anyway to increase/decrease a light temp/kelvin in steps of percentage ?
I have it working for brightness with the JSON format but not to sure of temperature or kelvin steps

 {
   "brightness_step_pct":"15",
   "transition":".3"
}

I can set the kelvin temp of the bulb but would like to move it up/down by steps with a switch.
Thanks
Andrew