How to get the ngFor index value

Question

Could help me in a doubt, I have a form with an array where there is the FormControl "id". Is there any way to receive the value of index to fill in this field?

<tr *ngFor="let item of invForm.controls.tool.controls; let i= index" [formGroupName]="i" >
    <td>
        <mat-form-field floatLabel='never'>
            <input matInput type="number" style="text-align: right" formControlName="Id"  value="{{i+1}}"  >
        </mat-form-field>
    </td>
</tr>

I made this example in stackblitz.

[Solved]

I solved the problem with the trackBy: trackByFn

<tr *ngFor="let item of invForm.controls.tool.controls; let i= index ;trackBy: trackByFn" [formGroupName]="i"  >

and in the component,

 trackByFn(index, item) {

     item.value.Id = index+1
    return index; 
  } 

I also leave the resolution on stackblitz

Answer 1

<ul>
  <li *ngFor="let item of especialidades; let i = index">
    {{i}} {{item.codigo}}
  </li>
</ul>

Angular syntax ngFor: https://coryrylan.com/blog/angular-ng-for-syntax