title: Angular 8 - Adding calculated value into formGroup by using formControlName
body: <p>I want to add Data period column calculated values into formGroup using formContolName="interval".</p>
  
  <pre><code>&lt;td formContolName="interval" class="form-control"&gt;{{onlyyears(this.dynamicForm.value.tickets[i].startday,this.dynamicForm.value.tickets[i].endday)}}&lt;/td&gt; 
  </code></pre>
  
  <p>How to fetch calculated value into formControlName="interval"?
  Code in below link,
  <a href="https://stackblitz.com/edit/angular-326sky?file=src%2Fapp%2Fapp.component.html" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-326sky?file=src%2Fapp%2Fapp.component.html</a></p>