ngx-select-dropdown set displayKey with multiple values

I am using ngx-select-dropdown with search feature and I want to set multiple displayKey values like: firstname and lastname.

Below is my config object:

dropdownconfig = {
displayKey: 'firstName, lastName',
search: true,
placeholder: 'Select User',
height: '150px'
};


html:

<ngx-select-dropdown (change)="selecteAdmin($event)" [config]="dropdownconfig" [options]="allUserData" [(ngModel)]="singleSelect" [multiple]="false" ></ngx-select-dropdown>


How to display multiple values for displayKey? Also, need validation on that drop-down.

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