title: Can't bind nested form group to form array in reactive Forms?
body: <p><a href="https://stackblitz.com/edit/angular-reactive-forms-eg-s1v5zs?file=src/app/app.component.html" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-reactive-forms-eg-s1v5zs?file=src/app/app.component.html</a></p>
  
  <blockquote>
    <p>Could not  bind {form control} to data [
      {
        "group1": "",
        "group2": {
          "data": ""
        }
      }
    ]</p>
    
    <blockquote>
      <p>Need to bind using form control name </p>
    </blockquote>
  </blockquote>
  
  <pre><code>
   &lt;form [formGroup]="formGroup"&gt;
      &lt;div formArrayName="features"&gt;
          &lt;div class="row no-gutters form-group" *ngFor="let feature of features.controls; let i = index; let last = last"
              [formGroupName]="i"&gt;
              Grp:1 &lt;input
          type="text"
          class="form-control px-2 col"
          formControlName="group1"
          title="feature"
          &gt;
              &lt;!-- //How to bind  value of data in html??? --&gt;
              &lt;div [formGroup]="group2"&gt;
                  &lt;input type="text"
                  class="form-control px-2 col"
                  formControlName="group2"
                  title="feature"
                  &gt;
              &lt;/div&gt;
              &lt;button class="col btn btn-success" (click)="addFeature()"&gt;
                  +
                  &lt;/button&gt;
          &lt;/div&gt;
      &lt;/div&gt;
      &lt;pre&gt;
      {{ features.value|json}}
    &lt;/pre&gt;
  &lt;/form&gt;
  
  typeScript
    constructor(private fb: FormBuilder) {
      this.addFeature();
    }
    formGroup = this.fb.group({
      features: this.fb.array([])
    });
    get features(): FormArray {
      return this.formGroup.get("features") as FormArray;
    }
    addFeature(): void {
      let data = this.fb.group({
        group1: new FormControl("grp_1"),
        group2: this.fb.group({
          data: new FormControl("grp_2")
        })
      });
      this.features.push(data);
    }`enter code here`
  </code></pre>