What plugin is that? It really simple to set up your own Blueprint to derive sun intensity/color based on angle, but it might need an override because most of the time you never use a sun angle ~10 degrees from the horizon because of long shadow view distances and cascaded shadow bias issues if you use the default filtering.
I appreciate the new additions for 4.21, especially the min/max auto exposure with EVs. It’d be great to get some view modes to measure per-pixel Luminance and Illuminance based on geo only to get a horizontal Lux reading. Going in and out of the Pixel Inspector can be tedious with the amount of back and forth needed for getting values in range, even more so when you have to disable certain screen-effects every time to not measure Luminance through Bloom.