Accessing extension settings from server-side handler

I’m developing a jupyterlab extension that has settings. When I call settingRegistry.load(plugin.id) in my JupyterFrontEndPlugin I successfully resolve the settings that are currently in effect. (E.g. when I populate $PREFIX/share/jupyter/lab/settings/overrides.json with settings for my extension, I can see those settings as I expect.)

However, I can’t figure out how to access these same resolved settings for my extension from my server-side handler. What is the equivalent of settingRegistry that can be used in route handlers?

Thanks for any help!