如何为小工具创建不同的字体大小，并允许它们随PySide2中的字体对话框进行缩放？

import sys
from PySide2.QtWidgets import QApplication, QWidget, QVBoxLayout, QPushButton, QLabel, QFontDialog
from PySide2.QtGui import QFont

class FontSizeWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        layout = QVBoxLayout()

        self.label = QLabel("Hello, PySide2!", self)
        self.label.setFont(QFont("Arial", 12))  # 初始字体大小
        layout.addWidget(self.label)

        self.button = QPushButton("选择字体大小", self)
        self.button.clicked.connect(self.changeFontSize)
        layout.addWidget(self.button)

        self.setLayout(layout)
        self.setWindowTitle('字体大小调整示例')

    def changeFontSize(self):
        font, ok = QFontDialog.getFont()
        if ok:
            self.label.setFont(font)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    widget = FontSizeWidget()
    widget.show()
    sys.exit(app.exec_())