Automation change LoveLace Card Theme

Configuration
1

I just started using Lovelace and cant quite figure out how set a new theme for a particular card. For example, if I have a card title “Warnings” with a default theme of “Normal-Theme” which I want to set to “Red-Theme” when the device sensor.freezer.tempurature reports a temperature above 0 , how would the automation look?

Thanks in advance

2

Did you ever find a way to do this? I’d like to do something pretty much the same.