Mired to Kelvins - 2022 edition

Hi all,
I have found some posts on converting the basic Lovelace light card from Mired to Kelvin from at least a year ago, and for those us not using MQTT, there seems to be very little information out there. Have I missed something? Or is this a piece of development that isn’t as simple as it seems?

Here’s my case - I’d like this slider to be in Kelvins and expose itself to HA Cloud as such.
2022-08-08 11_37_10-Overview – Home Assistant

Any ideas?

Did you find any more info on this? I would also like to have that.