I come from Backyard OES where I found that feature really useful. I could not find this feature in Ekos and thought that was because I was saving as FIT files and not using the native RAW format of my Canon 1000D (CR2 files)
In BYOE I got files named like this : Light_0012_ISO800_300s__18C_M57.CR2 where "18C" is the temperature in Celsius.