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Actually, that variable is used to define a specific angle implementation (when Qt is configured to use the included Angle libraries). Thus it would actually be the same as using Qt::AA_UseOpenGLES. Your variable is how you configure Angle to use d3d9, d3d11, or warp.
Kevin's suggestion of using QT_OPENGL=software is synonymous with Qt::AA_UseSoftwareOpenGL, and how you force the use of the included software-based Mesa renderer (opengl32sw.dll).
QT_ANGLE_PLATFORM=warp will attempt to use microsoft's software based rasterizing software built into Direct3D11 and higher.
It's still worth a shot, for sure, but I just wanted to clear up the misconception that it's the same as using Qt::AA_UseSoftwareOpenGL.
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