I am developing an extension for Jupyterlab 4 and would like to have my extension add keyboard extensions when installed. How should this be done on Jupyterlab 4? When I was working on Jupyterlab 3, I needed to add my shortcuts to the /schema/plugin.json file under jupyter.lab.shortcuts but using my old plugin.json is not working and I am not getting working shortcuts or even seeing my extension in the settings menu. Do I need to register my shortcuts in the typescript code or is this plugin.json file no longer the way to add keyboard extensions?
plugin.json is the preferred way of adding shortcuts in JupyterLab 4. Can you provide more details?