Yup!
In this case, I don’t think you’ll need to import the Service class. That would only be needed if you were creating your own Service. You just need the service injection decorator.
And in the latest version of Discourse/Ember, it can be simplified even further to avoid needing the ‘inject as’ alias. Ember now make the injection decorator available directly as service.
import { service } from "@ember/service";
(but the old { inject as service } still works, and I’m not aware of any plans to deprecate it in Ember)
EDIT: But maybe I can use decorateWidget instead of a plugin outlet. . .