If you are hoping to bring scenes into Hubitat, then you'll need to use one of the community integrations rather than the built-in app. I personally use CoCoHue as well to manage my hue integration. With multiple bridges, you'll need to separate instances (one for each bridge). Once that is done, you'll have everything into Hubitat and can decide how you want to share via the Alexa Skill.
Download the Hubitat app
