<script>
        sap.ui.getCore().attachInit(function() {
            sap.ui.component({
                id: "myComponentID",
                async: true,
                name: "myNamespace", // The namespace you defined in the bootstrap tag and points to the folder where the Component.js file is stored
                manifestFirst: true
            }).then(function(oNewComponent){
                new sap.m.Shell({
                    app: new sap.ui.core.ComponentContainer({
                        component: oNewComponent,
                        height : "100%"
                    })
                }).placeAt("content");
            })
        });
    </script>

/**
     * The component is initialized by UI5 automatically during the startup of the app and calls the init method once.
     * @public
     * @override
     */
    init: function() {
        //Map Component ID in a Core variable
        if(!sap.ui.getCore()._data_oLoadedComponents){
            sap.ui.getCore()._data_oLoadedComponents = {};
        }
        sap.ui.getCore()._data_oLoadedComponents.myCustomComponentId = this.getId(); // myCustomComponentId is the ID you want to use for this specific app
        // END: Map Component ID in a Core Variable

        // call the base component's init function
        UIComponent.prototype.init.apply(this, arguments);

        // set the device model
        this.setModel(models.createDeviceModel(), "device");
    }

sap.ui.getCore().getComponent(sap.ui.getCore()._data_aLoadedComponents.myCustomComponentId)

sap.ui.getCore().getComponent(sap.ui.getCore()._data_aLoadedComponents.myCustomComponentId).getModel('modelName')