To , you primarily use Adobe Photoshop's Camera Raw filter to transform 3D LUTs (typically used in video) into Adobe Camera Raw (ACR) profiles that Lightroom and Photoshop can use for photos. Step-by-Step: How to Convert .cube to .xmp
Never use online "free converters" that claim to turn CUBE into XMP. They strip gamma information, destroy highlight roll-off, and usually inject color noise. Color science is precise mathematics; treat your LUTs accordingly. convert-cube-to-xmp