Not sure if it's relevant, but maybe...
I've not got my car yet, it's in the UK and on it's way to the dealers. The dealer has however forwarded me on a link to a personalised webpage with a bunch of how-to videos (around 60 of them!) that are alledgedly tailored to the cars specific features, one of which is "Setting up Amazon Alexa". It just links to a YouTube video
here if anyone is interested.
A step towards it becoming available in the UK perhaps.