Ionic 3: Modal Controller - Get component Instance

I am showing a Component EventFeedbackComponent via ModalController. Now I want to subscribe to a Subject in EventFeedbackComponent. How do I get access to the component instance, to achieve my goal.

My current code:

let modal   =   this.modalCtrl.create(EventFeedbackComponent);
modal.present();

// This is not working. Throws the error "ERROR TypeError: Cannot read property 'subscribe' of undefined"
modal._component.feedbackSubmit.subscribe(feedbackResponse => {
    console.log(feedbackResponse);
});

Documentation didn't help in this regard: https://ionicframework.com/docs/api/components/modal/ModalController/

My use case:

• I have a list of Events in my Service, for which I need to get Feedback.
• EventFeedbackComponent has controls to get Feedback for a Single Event.
• Now, I show the EventFeedbackComponent to get feedback for First Event and listen for the event feedbackSubmit via Subject
• On submission of feedback, I show a Success Toast and switch my service variable in Service to show next event.
• Above point is repeated, till I get feedback for all Unreviewed events with the same Component shown via Model.