How to save JavaFX chart s as images

how to save javafx charts as images. please help me in this.
thanks in advance

Here is my pie2D chart. how to svae it as image file
Stage {
title: "Pie Chart"
scene: Scene {
content: [
PieChart {
title: "What Is Your Favorite Pie?"
titleFont: Font { size: 24 }
data: [
PieChart.Data {
value: 21
label: "Pumpkin"
PieChart.Data {
value: 33
label: "Apple"
PieChart.Data {
value: 17
label: "Cherry"
PieChart.Data {
value: 29
label: "3.14159"
}

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