LCH is a hue-based version of LAB, which is perceptually uniform (when changing one dimension at a time) and easy to read, but unfortunately the gamut of what's displayable on a screen when viewed in this space is weird and hard to work with programatically. Specifically the higher C values are only available for the upper middle L values, and are hue dependent.
You could "fix" this by stretching any one of the values to fit in gamut - pick two and use a percent of the max in-gamut value for the third. It looks like this space is LH+C%. But that makes the chroma (saturation) no longer uniform. You could also do HC+L%, which makes luminence (brightness) no longer uniform, and would do a weird thing where L=0 is only black when C=0. You could also do LC+H% which would have weird discontinuities in hue and be generally funky.