Can Alexa control the "W" in RGBW? I'm only able to do RGB with my Fibaro

I have a Fibaro RGBW Controller 2 and I am currently using the official Fibaro device handler. Changing the color works just fine with Alexa however I am unable to control the “W” white LEDs. If they are turned on (via ST app) and I say “Alexa set cabinet lights to red” then the strip will change to red and the white lights will turn off.

Is there any way to control the white channel via Alexa?