Cypress::intercept function - can intercept external resources as well?

[tal-rofe]

So I understand I can use intercept function in order to intercept some API calls been sent from my frontend code for example.
Of course I cannot stub some server code.

In my server code I send some API calls for an external resource.
In order to make full e2e testing, I'd like to stub some server code as well.
So my best option is to intercept these server API calls as well.

Is it possible? What is the best option to fully test the application e2e?