JavaFx: How to set the labelFor property of a Label in FXML?

I have a TextField and a Label with mnemonicParsing true. I want to set the labelFor property of the label with the id of the TextField. How do I do that in FXML?

<GridPane hgap="5.0" snapToPixel="false" vgap="10.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<children>
      <Label maxWidth="-Infinity" text="_A Label" GridPane.halignment="RIGHT" GridPane.hgrow="NEVER" GridPane.vgrow="NEVER" mnemonicParsing="true" />
      <TextField id="myTextField" GridPane.columnIndex="1" GridPane.hgrow="NEVER" />
</children>
</GridPane>

Thanks