VirtualKeyboardSettings.availableLocales are not available at Component.onCompleted

import QtQuick
import QtQuick.Controls.Basic
import QtQuick.VirtualKeyboard
import QtQuick.VirtualKeyboard.Settings

Window {
    id: window
    width: 640
    height: 480
    visible: true

    function printLocales() {
        console.log("Available locales:", VirtualKeyboardSettings.availableLocales)
    }

    Column {
        TextField {}
        Button {
            text: "List available locales"
            onClicked: window.printLocales()
        }
    }

    InputPanel {
        id: inputPanel
        z: 99
        x: 0
        y: window.height - (inputPanel.active ? inputPanel.height : 0)
        width: window.width
    }

    Component.onCompleted: window.printLocales()
}