Access a ChartView's series in QML imperatively

main.py

from pathlib import Path
import sys
from PySide6.QtCore import QUrl, QObject, Property, Signal, Slot
from PySide6.QtWidgets import QApplication
from PySide6.QtQml import QmlElement, QQmlApplicationEngine
from PySide6.QtCharts import QAbstractSeries

QML_IMPORT_NAME = "name.kyzivat.piechart_example"
QML_IMPORT_MAJOR_VERSION = 1

@QmlElement
class ChartHandler(QObject):
    all_series_changed = Signal()

    def __init__(self):
        super().__init__()
        self._all_series = []

    def get_all_series(self):
        return self._all_series

    @Slot(QAbstractSeries)
    def addSeries(self, series):
        self._all_series.append(series)
        self.all_series_changed.emit()

    @Slot()
    def printSeriesInfo(self):
        for i,s in enumerate(self._all_series):
            print(f"Series {i} {type(s)}:")
            for j in range(s.count()):
                print(f"Slice label: {s.slices()[j].label()}")

    all_series = Property("QVariantList", get_all_series, notify=all_series_changed)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    engine = QQmlApplicationEngine()

    qml_object_created = [False]
    def handle_qml_load_errors(obj, _url):
        qml_object_created[0] = obj is not None
    engine.objectCreated.connect(handle_qml_load_errors)  # pylint: disable=no-member

    qml_file = Path(__file__).parent / "piechart.qml"
    engine.load(QUrl.fromLocalFile(qml_file))

    if not qml_object_created[0]:
        sys.exit(1)

    app_errcode = app.exec()
    sys.exit(app_errcode)

piechart.qml

import QtQuick
import QtQuick.Controls
import QtCharts
import name.kyzivat.piechart_example

ApplicationWindow {
    width: 400
    height: 300
    visible: true

    ChartView {
        id: chart
        anchors.fill: parent
        antialiasing: true

        PieSeries {
            id: pieSeries
            startAngle: 0
            endAngle: 180
            PieSlice { label: "eaten"; value: 44.9 }
            PieSlice { label: "not yet eaten"; value: 5.1 }
        }
        PieSeries {
            id: pieSeries2
            startAngle: 180
            endAngle: 360
            PieSlice { label: "full"; value: 3.33;
            }
            PieSlice { label: "not full"; value: 6.67;
            }
        }

        ChartHandler {
            id: chartHandler
        }

        Component.onCompleted: {
            for (var i = 0; i < count; i++)
                chartHandler.addSeries(series(i))
        }
    }

    MouseArea {
        anchors.fill: parent
        onClicked: {
            chartHandler.printSeriesInfo();
        }
    }
}