Just for info, there exists software to enable reading/writing on ExtFS partition (like the one with the roms for recalbox).
I've tried the trial version (30 days I think) of the one called extFS by Paragon. It works perfectly. I think the full version is approx 40$
There are free software that permits also to do that, namely OSXFuse but it seemed a bit less user friendly, I did not try it.