I would like to rotate/ flip a graphic element using the Pro SDK but could not find any references for doing this.
See below images for reference.
Line element with marker arrow symbol

Marker arrow symbol after vertical flip

Below is the code snippet of how I'm creating an element. How can I rotate or flip it while creating it?
CIMSymbolReference symbolReference = SymbologyHelper.GetLineSymbolReference("Marker Arrow 1");
CIMLineGraphic cimGraphicElement = new CIMLineGraphic
{
Line = geometry as Polyline,
Symbol = symbolReference
};
graphicsLayer.AddElement(cimGraphicElement);