Reading EXR images on iOS

When using the prebuilt iOS release of OpenCV 4.5.5, I can’t load EXR images using cv::imdecode(). Can somebody help me on how to get EXR decoding to work on iOS?
Looking at CMakeLists.txt I saw that WITH_OPENEXR seems to not be visible at all for apple framework builds. I also saw in the cv::imread() docs that there would be some possibility to use native OS X image readers. Unfortunately I didn’t find where/how to enable this option and if it would also be available for iOS