在QLabel中悬停时，如何临时更改链接的颜色？

from PyQt5.QtWidgets import QLabel
from PyQt5.QtCore import Qt, QEvent

class MyLabel(QLabel):
    def __init__(self, parent=None):
        super().__init__(parent)

    def event(self, event):
        if event.type() == QEvent.Type.Enter:
            self.setStyleSheet("QLabel { color: red; }") # 设置链接的临时颜色为红色
        elif event.type() == QEvent.Type.Leave:
            self.setStyleSheet("QLabel { color: blue; }") # 悬停结束后恢复链接的默认颜色为蓝色

        return super().event(event)

from PyQt5.QtWidgets import QMainWindow, QApplication

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        label = MyLabel(self)
        label.setOpenExternalLinks(True) # 允许在浏览器中打开链接
        label.setText('<a href="https://www.example.com">Example Link</a>')
        label.setFixedWidth(200)
        label.setAlignment(Qt.AlignCenter)
        self.setCentralWidget(label)

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()