Missing Support for "needsOffscreenAlphaCompositing" View Property

https://reactnative.dev/docs/view#needsoffscreenalphacompositing

Whether this View needs to rendered offscreen and composited with an alpha in order to preserve 100% correct colors and blending behavior. The default (false) falls back to drawing the component and its children with an alpha applied to the paint used to draw each element instead of rendering the full component offscreen and compositing it back with an alpha value. This default may be noticeable and undesired in the case where the View you are setting an opacity on has multiple overlapping elements (e.g. multiple overlapping Views, or text and a background).

Rendering offscreen to preserve correct alpha behavior is extremely expensive and hard to debug for non-native developers, which is why it is not turned on by default. If you do need to enable this property for an animation, consider combining it with renderToHardwareTextureAndroid if the view contents are static (i.e. it doesn't need to be redrawn each frame). If that property is enabled, this View will be rendered off-screen once, saved in a hardware texture, and then composited onto the screen with an alpha each frame without having to switch rendering targets on the GPU.

Supported on both Android and iOS

Start with the linked View property documentation and compare its Android and iOS behavior with react-native-windows. Trace the Windows View implementation to determine where needsOffscreenAlphaCompositing belongs and how existing view properties are handled. Done means the property is supported on Windows with behavior consistent with the documented semantics and covered by the relevant tests.