Is it possible to reference screen width & height as a (dynamic/static) resource?

I can specify system colors in xaml using "{DynamicResource {x:Static SystemColors.ControlBrushKey}}" etc. Is it possible to do something similar but for screen width and height, e.g. {x:Static SystemColors.ControlBrushKey} / 2 etc?

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Gouranga Gupta :-)