Customizing filter menu operators list in Angular Grid component

import { Component, OnInit } from '@angular/core';
import { data } from './datasource';
import { FilterSettingsModel } from '@syncfusion/ej2-angular-grids';

@Component({
    selector: 'app-root',
    template: `<ejs-grid [dataSource]='data' [allowFiltering]='true' [filterSettings]='filterOptions' height='273px'>
                <e-columns>
                    <e-column field='OrderID' headerText='Order ID' textAlign='Right' width=100></e-column>
                    <e-column field='CustomerID' headerText='Customer ID' width=120></e-column>
                    <e-column field='ShipCity' headerText='Ship City' width=100></e-column>
                    <e-column field='ShipName' headerText='Ship Name' width=100></e-column>
                </e-columns>
                </ejs-grid>`
})
export class AppComponent implements OnInit {

    public data: object[];
    public filterOptions: FilterSettingsModel;

    ngOnInit(): void {
        this.data = data;
        this.filterOptions = {
           type: 'Menu',
           operators: {
               stringOperator: [
                   { value: 'startsWith', text: 'starts with' },
                   { value: 'endsWith', text: 'ends with' },
                   { value: 'contains', text: 'contains' }
                ],
            }
        };
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { GridModule, FilterService, PageService} from '@syncfusion/ej2-angular-grids';
import { AppComponent } from './app.component';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        GridModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [FilterService, PageService]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);