Load Diagrams into BPMN Modeler + Properties Panel

I would like to build an application around the Modeler + Properties Panel to manage BPMN models. With the pre-packaged version of the Modeler this would be very easy. Does anyone have a tip how I could solve this with the Modeler + Properties Panel?

Maybe this example might help? Or do you need a pre-packaged version with a properties panel included? This can be done with any bundler like webpack, e.g. shown in this example.