QML OSM地图上的传输层

Question

如何在qml中更改transport layer上的默认osm地图图层：

    Plugin {
        id: mapPlugin
        name: "osm"
         PluginParameter {
             name: "osm.mapping.host";
             value: "http://a.tile.openstreetmap.org/"
         }
    }

    Map {
        anchors.fill: parent
        plugin: mapPlugin
        center: QtPositioning.coordinate(59.91, 10.75) // Oslo
        zoomLevel: 14
    }