Change font & color inside widget?

Hi all,
i tried to change Font , color, of the data displayed inside a widget . Sometime it's working , sometime not .
The "Label" is displayed in Small Grey Color = good ! BUT the "Value format" not !
small

diff

I know it's Angular filters , in this last . But how to translate html to Angular to have the desired font in "Value format"?

Not easy for a newbie like me :wink: Any idea ?
Thanks

Another way to change ui elements is to use UI Widget configuration via msg.ui_control
See justgauge parameters at the end of document.