Not exactly what you’re asking but you can follow @seanmor5 website over there → https://seanmoriarity.com/, he’s been posting some insight into Nx/Axon lately.
I will eventually get around to making more in-depth Nx and Axon example write ups. My goal is to implement all of the examples in the Axon repository as Livebooks with explanations of what’s going on. I recently did a more comprehensive Nx post here if you’d like to check that out