I’d suspect the answer for RawTherapee is much the same as it for darktable, in which case you should have a look at this thread: Linear to Log for Film Emulation in Darktable - Are 1D LUTs possible?
I’d suspect the answer for RawTherapee is much the same as it for darktable, in which case you should have a look at this thread: Linear to Log for Film Emulation in Darktable - Are 1D LUTs possible?