Have been using https://www.home-assistant.io/components/emulated_hue/ for sometime. It does not use HA Cloud though (not required actually).
With this, all the components registered in HA are emulated as hue devices for Alexa.
Note: I use Echo Plus, which has the abilities to discover devices. Not sure if this works with Echo or Dot.
Note: I use Echo Plus, which has the abilities to discover devices. Not sure if this works with Echo or Dot.