Ion-select does not show selected option when value is an object type

I am trying to use select-option values as objects.

 <ion-item>
    <ion-label>Choose</ion-label>
    <ion-select [value]="{key:'abc',value:'ABC'}">
      <ion-select-option value="{key:'abc',value:'ABC'}">ABC</ion-select-option>
      <ion-select-option value="{key:'pqr',value:'PQR'}">PQR</ion-select-option>
      <ion-select-option value="{key:'xyz',value:'XYZ'}">XYZ</ion-select-option>
    </ion-select>
  </ion-item>

When popup opens it does not show the selected value.

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