app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent {
  type;
  data_list = [65, 59, 80, 81, 56, 55, 40];
  data;
  options;
  
  ngOnInit() {
    this.chart_create_function();
  }

  chart_create_function() {
     this.type = 'line';
     this.data = {
      labels : this.data_list,
      datasets: [
        {
          data: this.data_list
        }
      ]
    };
     this.options = {
      responsive: true,
      maintainAspectRatio: false
    };
  }

}