Warm white on Tasmota bulbs with Node Red?

I’m using light bulbs flashed with Tasmota.

I can get a nice white light of varying ‘warmth’ using the web interface of the bulb, but I can’t seem to replicate the setting in the data field of the Service Node of Node-Red.

Does anyone have any ideas, please?

Got it!

I’d been trying “kelvin”: “3000” and it didn’t work - until I made it the first data item.