Making my Stadia controller work on bluetooth

I don't have a games console but really wanted to play Cyberpunk 2077 when it came out and Google Released it on Stadia so I go the package. It included a Chromecast Ultra and a very nice hand controller. Sadly, as with many Google forays, they decided to Sunset Stadia and it closed down on the 18th Jan 2023. The controllers bluetooth was locked out but they have released instructions on how to enable it for use with any bluetooth device - happy gaming!