Is there any way to get url path or inside nav_bar app

My nav_bar app is available by the url like this: https://{subdomain}.zendesk.com/agent/apps/event-example-app/subdir

Is there a chance to get path ("subdir" in the example) inside the app code.

I'm aware about the app.route.changed event, but it works only if path changed after the app is loaded and doesn't work if I open the url first time.

The usecase is as follows. I need to open the url from an external system (email for example) and be able to get the path in my code.

Please advice.