New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
	values: ['name', 'birthday'],
  
  actions: {
    saveData(data, name) {
      this.set(name, data);
    }
  }
});

templates.application.hbs

{{#my-component
	values=[ {} ]
as |data|
}}
	{{#data.component-name as |followerData|}}
  
  {{/data.component-name}}
{{/my-component}}


this.syncData(followerData);

templates.components.birthday-component.hbs

{{yield '15/09/1993'}}

templates.components.my-component.hbs

{{#each @values as |value|}}
	{{yield (hash 
    value=(component 
    	value 
      startDate=@starDate 
      endDate=@endDate 
      syncData=(action 'syncData' 'some-component')
     )
   )
   }}
{{/each}}

templates.components.name-component.hbs

{{yield 'tasha'}}

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}