It is not possible to add Xenon devices to a product at this time.
It is possible to create non-mesh products using the Argon and Boron as standalone Wi-Fi or cellular devices right now.
However being able to create mesh-based product including the Xenon will not be available in the short term. It will eventually be possible to do this, but I don’t have an exact date for that feature.
I too was hoping to add the Xenons to the Product that hosts their counterpart Argons. From my product’s perspective, they are the same so they would benefit from the useful features…firmware updates being the first.
I know you have a huge backlog, but I just wanted to voice my needs in case that influences during road map planning.