How to organize the loading of the service?

Question

Angular

There is a custom map class: class Map()

It contains the main business logic and must be loaded before the entire initialization of the angular application.

The class must be customizable by the user, for example, receive a flag for showing a simplified map of its parts.

How to properly organize the structure of Angular so that the application is embedded like Google Maps?

When can the user pass parameters?

If this class is run as a root service, then the possibility of configuration from outside is lost.

What would you do?