TextLiquidFill background text color from TextStyle color attribute

**Is your feature request related to a problem? Please describe.**
The text background color is inherited from the container that contains the TextLiquidFill.
It cause problem in nested container or widget.

**Describe the solution you'd like**
It would be convenient to have this settings directly on the TextLiquidFill widget, or retrieve it from the TextStyle.color attribute.

**Describe alternatives you've considered**
I didn't find any solution or workaround to make it work in my current use case.