reading the documentation really would have helped you to find that out yourself.
If you would have (for example) browsed that site here: ESP8266 Platform - ESPHome - Smart Home Made Simple
You would have had the right code block literally on top of the page after one sentence 
on the other hand the FastLED Light - ESPHome - Smart Home Made Simple docs were also linked which even tell you that in big fat red box 
What else would be needed that would take the 3 minutes to read the documentation @Slaaiblaar?
