Compare dynamic arrays of string angular 6

I have two arrays os strings. One of those will be an dynamic list of checkboxes. I want to check if the item contains in the other array. How can I do it dynamically using angular 6?

This is the current situation of the list of checkboxes... The checked need to be dynamic...

<div *ngFor="let p of people">
      <mat-checkbox class="example-margin secondary-text"
        [checked]="false" >p</mat-checkbox>
 </div>