Add conditional formating color option to cicle card sample

Hello, 

All is in the title, did someone have the part of code (type script) to add in the capabilities file for add the option to conditional format the color ?

I think its something very similar to the barchart sample : https://learn.microsoft.com/en-us/power-bi/developer/visuals/conditional-format?tabs=getFormattingModel

But I struggling a lot to adapt this for the circle card...

Thanks in advance for your help !

BR

Julien