QStyledItemDelegate alternative for QML

[demberto]

I looked at the QML TableView.delegate documentation and it doesn't mention how I could control what delegate is used based on my data type. I basically need a ComboBox to show a list of choices if my model data has a Python IntEnum.
I have a slight idea that some JS code would be involved here, but how can I execute isinstance in JS?
Is there a way I can "register" a delegate for IntEnum like I can do with QStyledItemDelegate?