store selected checkbox value. where the checkbox is inside an accordion class.This value need to be calculated for every item of accordion

isChecked(name){
    let tempI = this.chekcbOxValueArray.findIndex((x)=> x == name)
    return tempI>=0 ?true :false;
}

selectedWorker(name, checked){
    if(checked == true){
        this.a.push(name)
    }
}

onClickOkay(){
    item.workerNamesSelected = a.toString()
}

<div class="accordion-content">

    <div *ngFor="let item of accordianFields; let i = index">

        <!-- This is 1st item of accordian (chekcbox input) -->
        <div>
            worker Names
            <ng-template #checkBoxPopup>
                <div *ngFor="let worker of workerdataList">

                    <input type="chekcbox" [checked]="isChecked(worker.name)"
                        (click)="selectedWorker(worker.name, $event.target.checked)"
                        [(ngModel)]="item.workerNamesSelected" />
                </div>
                <div>
                    <button (click)="onClickOkay"></button>
                </div>
            </ng-template>
            <span ngbPopover="checkBoxPopup"></span>

        </div>\


        <!-- 2nd item  -->
        <!-- nth -->

    </div>
</div>

I am unable to get value for each item of accordion. The value remains same for all the accordion item -worker name.

Expected result:

for 1st item : some selected worker

for second accordion item : some other selected worker