text: import { LightningElement, track, api } from 'lwc';
  
  export default class App extends LightningElement {
      @track options = [
          { label: 'Value 1', value: '1' },
          { label: 'Value 2', value: '2' },
          { label: 'Value 3', value: '3' },
          { label: 'Value 4', value: '4' }
      ];
      @track defaultValues = [];
      setValues(event) {
          this.defaultValues = [1];
      }
  }
  