RGB LED strip with alexa color picker

  • Platform information: RPi 3b
    • OS: Debian 9.6
    • Java Runtime Environment: Zulu Embedded
    • openHAB version: 2.3.0
  • Issue of the topic:
    I have a Wifi-LED Controller (MagicHome) which supports RGB. I integrated it with the Wifi-Led binding. In the Sitemap and with voice commands I can change the color of the LED without any issues. Also I can create routines in the alexa app and select a color for the LED strip there.

But my problem is, that I want to go to the smart devices and pick the color there from a list. But there are only buttons to dim the LEDs. Is there any way to get this working?
Here is a screenshot from my problem:
How it is:

How I want it to be:

  • Please post configurations (if applicable):
    • Items configuration related to the issue
      Color MyWiFiLight_color "LED-Color" (gLight) ["Lighting"] {channel="wifiled:wifiled:XYZ:color"}
    • Sitemap configuration related to the issue
      sitemap default
      Frame label="LED Strip"{
      Switch item=MyWiFiLight_power label="TV-Bank"
      Colorpicker item=MyWiFiLight_color label="Color and Brightness"
      Sorry for my bad english and thank you in advance for your help.

Which UI is this?

Which UI is this?

Amazon Alexa Android app