quickfast The hardware has to support Widevine level 1 to increase Netflix resolution. So yes, it's possible in theory, but I don't think the user has the right hardware.
Using the Widevine CDM in Kodi you can decode it with the CPU. Unlike Widevine level 3 it can't be passed to the GPU for decoding.. I managed to get up to 720p on my amlogic s912 based box. At 1080p it fails the Altered Carbon test.