Filling a Silica ComboBox from PyOtherSide - approximate untested example

gistfile1.qml

import QtQuick 2.0
import Sailfish.Silica 1.0
import io.thp.pyotherside 1.0

ComboBox {
    width: 480
    label: "Foo Bar"
    id: fooBox
    property var dataModel : ListModel {}
    Python {
        id: py
        Component.onCompleted: {
            // Add the directory of this .qml file to the search path
            addImportPath(Qt.resolvedUrl('.'));
            // Import the main module and load the data
            importModule('listmodel', function () {
                py.call('listmodel.get_data', [], function(result) {
                    // Load the received data into the list model
                    for (var i=0; i<result.length; i++) {
                        dataModel.append(result[i]);
                }
            }); 
        });
        }    
    }
    menu: ContextMenu {
        Repeater {
            model: fooBox.dataModel
            MenuItem {
                text: "Item #" + model.index
            }
        }
    }
}