It would be really useful to be able to open a jp_proxy_widget in a new JupyterLab output window. This would provide a simple mechanism for then creating JupyterLab apps running in their own window as simple jp_proxy_widget wrapped Javascript applications.
Related issue: jupyterlab/jupyterlab#3692
I had wondered in the past if `jupyterlab-sidecar' might offer an alternative route (or suggest some plumbing that would allow a widget to be opened directly in a new output window) but it appears to be a stale project?