Looking for package names for convert Temperature ToGeneric Color Name

Does anybody know the full "package" name path for these functions

convertTemperatureToGenericColorName()
convertHueToGenericColorName()

I'm trying to use them in a closure that is at the @Field static level, and the compiler isn't finding them. I wanted to try and import the package or precede them with their full package name, but I am not sure what that is.

I tried some variations like ...
hubitat.helper.ColorUtils.convertTemperatureToGenericColorName()

but I just can't seem to hit on the right one.

The ColorUtils object is documented here: ColorUtils Object | Hubitat Documentation and they aren't part of that.

These methods are listed here Common Methods | Hubitat Documentation but there is no package or object name that is listed.

They work in normal not @Field static level code, but as mentioned, this is an odd case of using them in a closure that is at the @Field static level, so I think I need the full package name or to import the package.

tried and failed.