Feature Request: Optionally display light level of water blocks

[WinterFollowsSpring]

Since drowned can spawn on any water block beneath another water block, at and below sea level, even well above the sea floor, in all River and Ocean biomes, Dripstone Caves, and Aquifers it would be useful to know the light level of all water blocks. Could you please add the option to display the light level of water blocks?