Hold action to toggle between color temperature of a light

Hello!

I’m new with HA, and have close to 0 experience with coding in general, so please bear with me. I’ve set up a regular mushroom light card and I would like that on hold to switch between two (or maybe more in the future) color temperature values of the bulb. Logic would be: when holding down the card/switch/button, if color temperature is 2000 set color temperature 6000, else set color temperature to 2000. That way it should switch between 2000 and 6000 regardless of what value it had before the first hold press.

I’ve read a bit and I think that it might be possible using “call-service” but I don’t know how to insert that if/else function in there.

type: custom:mushroom-light-card
entity: light.led_a60_rgb
fill_container: true
use_light_color: true
show_brightness_control: true
show_color_temp_control: true
show_color_control: false
collapsible_controls: false
primary_info: name
secondary_info: state
icon_type: icon
tap_action:
  action: toggle
grid_options:
  columns: 12
  rows: 2
hold_action:
  action: call-service

How do I continue from here?

Many thanks for all your help!