QtGraphicalEffects does not include qml files in static builds

When performing a static build, the following qml files are not being included in any library:

Blend.qml
BrightnessContrast.qml
Colorize.qml
ColorOverlay.qml
ConicalGradient.qml
Desaturate.qml
DirectionalBlur.qml
Displace.qml
DropShadow.qml
FastBlur.qml
GammaAdjust.qml
GaussianBlur.qml
Glow.qml
HueSaturation.qml
InnerShadow.qml
LevelAdjust.qml
LinearGradient.qml
MaskedBlur.qml
OpacityMask.qml
qmldir
RadialBlur.qml
RadialGradient.qml
RectangularGlow.qml
RecursiveBlur.qml
ThresholdMask.qml
ZoomBlur.qml

These files are in the folder: qtgraphicaleffects/src/effects and are part of the QtGraphicalEffects module.

The effects_plugin.pro project, which accounts for these files. does not produce a library and hence static builds are missing these files. This prevents importing the QtGraphicalEffects module in qml files for static builds.