passport.authenticate() with custom query string param?

[GeoffreyPlitt]

I am successfully authenticating with e.g. router.get("/auth/", passport.authenticate("spotify", {})). But I'd like to send a custom param in the query string (e.g. the users timezone).

The docs say:
In this example, note that authenticate() is called from within the route handler, rather than being used as route middleware. This gives the callback access to the req and res objects through closure

But that looks to be for writing my own strategy. I want to use the spotify strategy, but get access to that query string var from the original auth route.

Is this possible?