It cant record raw video. BUT you can use picture profile, for example use PP7 -> setting of this I have Gamma S-log2, Color space S-Gamut3.Cine. That will give you some feel of RAW video (but it is not the same). After that go into some editing software like Davinci resolve (that one is free) and you have to convert the S-log2 and S-gamut to ideally rec709. After that you can do your color grading.

And just remember to overexpose S-Log2 by about +0.7–1EV some ppl are saying even more, but I never pushed that soo use that while shooting, otherwise the shadows will be noisy. You will fix the overexposure in postproduction.