问如何通过传递DropDown值的id自动选择下拉值？

EN

                       <div class="col-md-6 ">
                            <div class="form-c rfcol">

                                <select id="jobData" name="jobTitle" [(ngModel)]="selectedGroup"
                                    [ngModelOptions]="{standalone: true}" placeholder="Select name of the post applying for">
                                    <option  disabled selected value="Select">Select name of the post applying for</option>
                                    <option *ngFor="let item of jobData" [ngValue]="item">{{item.jobTitle}}</option>
                                </select>

                            </div>
                        </div>

ngOnInit(): void {
    this.gotoTop();
    this.careerJobid = this.route.snapshot.params.id;
    this.backendService.getjobs().subscribe(jobData => {
      this.jobData = jobData;

      console.log("Job List")
      console.log(this.jobData)

    });

  }