gráfico ngx como usar no angular

<h3>Pie Chart</h3>
<ngx-charts-pie-chart
  [results]="surveyData"
  [legend]="true"
  [legendTitle]="'Vehicle Survey'"
  [view]="[1000,300]"
  [labels]="true" >
</ngx-charts-pie-chart>
Grieving Gecko