I expose all our zigbee lights to Alexa via this Nabu Casa integration. To do this, I go to the “manage entities” link in the integration, then locate and click each light and set it to expose entity. It takes way longer than it should, because I have to sift through hundreds of entities. It would be wonderful to be able to filter the page by type, or even just a search function.
Oh, and I’m NOT sharing the entire “lights” domain, because I don’t want to share every individual bulb.