The HUE Skill and the direct integration will not help you with the sensor, because the Hue integration does only forward lights and no sensors at all.
Im my environment I have integrated door/window sensors, temperature sensors and Smoke sensors and all of them are transferred to Alexa with the hombridge-alexa plugin.
Matter will not help you too. because all of the vendors have to support matter and I don’t think that phoscon/deconz will support matter at any time…
Interessting, as we actually work on the Thread implementation:
Anyways. At the moment Alexa can´t handle any Information from Sensors who are connected over us. We could build a Alexa Skill, but the requests about that are just very few and we have (tbh) not the time to do that. Alexa can of course handle lights without bigger issues.