In the meantime: → No direct “cube to xmp” file converter exists, but you can embed a .cube into an .xmp preset via Adobe Camera Raw (Photoshop) or 3D LUT Creator .

: The .xmp profile acts as a "base layer" for the image, allowing you to use the standard Lightroom sliders (exposure, contrast, etc.) on top of the LUT's color transformation. Adjustment Strength : Once converted to an XMP profile, you can often use an Amount slider in Lightroom to adjust the intensity of the LUT. Profile Packing

You cannot import a .cube into Lightroom, but you can emulate it.