Turns out you are correct! I can feed that node strings.
I was getting an error because of a separate issue.
And for those curious, I was able to answer my original question with this code in a python script node:
import clr
clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import *
import System
OUT = System.Enum.GetValues(Autodesk.Revit.DB.ExportRange)