Getting color_temp state from RGB Controller

Configuration
1

I got a few RGBW controllers (Magic Home) and flashed them to use Espurna. (ARILUX_AL_LC06)
Setup the HA and MQTT integration and everything is working like a charm.

Now i also have 2 muller light RGBW remotes and am setting them up to control the lights.
Now hitting a snag with setting the color temp. Well, setting goes fine. But reading the color temp not so much.

These are the states i get from the light:

min_mireds: 153
max_mireds: 500
supported_color_modes:
  - color_temp
  - hs
color_mode: hs
brightness: 255
hs_color:
  - 2
  - 100
rgb_color:
  - 255
  - 8
  - 0
xy_color:
  - 0.699
  - 0.3
friendly_name: RGB Light
supported_features: 59

So it seems there is no way to read out color_temp. But i can send it.
In my automation i have this code:

  action:
    - service: light.turn_on
      target:
        entity_id: light.rgb_light
      data:
        color_temp: 500

Which send the color_temp and works.
What i wanted to do is get the color temp and increase/decrease it like this:

data: >
  {% set ct = state_attr('light.rgb_light', 'color_temp') | int %}
  {{ [ct+50, 500] | min}}

This just sends ‘50’ because it gets nothing from color_temp.
I’ll prob have to calculate the color_temp from the xy values?