I used the CMSTestPattern and GenerateLUT nodes, together with a Colorspace node for the Lin to sRGB conversion. The help message on each node will tell you how to set it all up.
I’m a Nuke compositor and do not know Resolve, but I find it really strange that a professional grading application does not have something as basic as a Lin to sRGB LUT. I’ve exported a LUT out of Nuke that I hope will do the trick for you: