Can the model object for a learner be exported with joblib?
I don't understand what "exported with joblib" refers to, but you can save trained Orange models by pickling them, or with Save Classifier widget if you are using the GUI.
I'm evaluating orange as a potential solution to helping new entrants into data science to get started. I would like to have them save out model objects created from different algorithms as pkl files similar to how it is done in scikit-learn with joblib or pickle.