Reactive form for each table row

I'm using Angular 2 and I want to validate controls in each row separately. But I'm not getting any way to do that. I want it to be done using reactive forms only and not using template-driven approach. I want [formGroup] on each <tr>. Any help will be appreciated. Below is the structure of my code:

<tbody *ngFor="let single of allTeamDetails"                
       [ngClass]="{'alternate-row-color': $even}">
  <tr>
    <td class="td-data first-column">
      <input type="text" class="input-text form-control" 
             [value]="single.first_name">
    </td>
    <td class="td-data second-column">
      <input type="text" class="input-text form-control" 
             [value]="single.last_name">
    </td>
    <td class="td-data third-column">
      <input type="email" class="input-text form-control" 
             [value]="single.email">
    </td>
    <td class="td-data fourth-column">
      <select class="selection-dropdown width-80-percent" 
              [value]="single.user_role">
        <option *ngFor="let singleRole of allUserRole"      
                value="{{singleRole.name}}"> 
                {{setUserRoleAndType(singleRole.name)}}</option>
      </select>
    </td>
    <td class="td-data fifth-column" >
      <input type="password" class="input-text form-control">
    </td>
    <td class="td-data sixth-column" >
      <input type="password" class="input-text form-control">
    </td>
    <td class="td-data save-send-tm-data">
      <button class="btn save-user-details save-sub-account-details"                                                      
              type="button" data-toggle="tooltip" title="Save">
        <i class="fa fa-floppy-o" aria-hidden="true"></i>
      </button>
    </td>
    <td class="td-data save-send-tm-data">
      <button type="button"                                      
              class="btn save-user-details save-sub-account-details"  
              data-toggle="tooltip" title="Send Message"                       
              (click)="openSendMessageModal(single.email)">
        <i class="fa fa-envelope" aria-hidden="true"></i> 
      </button>
    </td>
  <tr>
</tbody>