The Alexa XTand Alexa Classic with the XR recording module both have the ability to read ASC CDL (Color Decision List) LUT settings as they record.
This means that, over Ethernet, the camera can take in a Look and store it in the Raw footage as metadata. This is done by enabling a CDL server on the camera and then sending in CDLs with different software programs. This CDL can then be applied to the Raw footage through post or when downloading with the Codex UI. Watch the video above to see how I use this great option with Pomfort's LiveGrade software and the Codex Raw workflow.