How to get a specific data for my ngmodel on an array

#1
  <ion-item>
          <ion-label color="primary">Monitor Price</ion-label>
      </ion-item>
    <ion-item>
      <ion-label>Choose Market </ion-label>
      <ion-select [(ngModel)]="market_id">
        <ion-option *ngFor= "let d of dataArraymarket">{{d.market_id}} {{d.market_name}}</ion-option>
         
      </ion-select>
    </ion-item>

I want to have the market_id only because its what i only need for my database but I want to show them both . Thank you in advance for the help