I had the luck to play with that awesome piece of software. I'm currently struggling to generate LUT. The only options I saw was 3D that is in some .cube format.
What I want to achieve is something like that i.imgur.com/pzt06X0.png
First create video project with 512x512 pixels with maximum color depth as possible for png 24(best is 24 bit if it possible) Second. put neutral-lut file in your project and apply your own LUT on this png and export this as still png with. Ready