darktable-chart crashed for me in darktable 4. It has worked before. And for Canon the PFM file was never that dark.
You can try this LUT 3D file I generated with Creating 3D .cube LUTs for camera OOC styles
If you want a better profile, take some more raw samples. Best would be with a lens with no lens correction in JPEG.
E-M10 Mark II.zip (13.1 KB)