Dynamically setting color of New Xaml styling chart title

[Nick-Crane]

In latest update 2.0.0-rc6 we can now use Xaml to set much of the chart components.
In examples there are a few instances of setting the chart title with fixed values.
Firstly, the title is a XamlDrawnLabelVisual not text.
Also, the color (Paint) in this is defined using a SolidColorPaint.
The Color of the SolidColorPaint is not compatible with the colors in Avalonia.
In fact, it seems to be a text property!?
So how do I change this color to follow dynamically the Avalonia theme (e.g. Fluent Light/Dark change)?