https://forums.autodesk.com/t5/revit-api-forum/schedule-conditional-formatting-api/td-p/6980242
Looking at this thread, it doesn’t appear that Revit API is able to do conditional formatting yet. If Revit API is not capable of it, neither is Dynamo. And looking thru the API, I also couldn’t find anything useful. So for now, it is not possible.