Return value quando viene chiuso un Qwidget

Ciao a tutti,

sto creando un applicazione con pyqt6 e vorrei che una pagina qwidget di richiesta login ritornasse una variabile al main quando le credenziali sono corrette, in modo da poter aprire la finestra principale. é possibile?

un esempio: (guardare dove ho messo ‘’'----?….?----''')

class LoginWindow(QWidget):
    def __init__(self):
        super().__init__()
        loginSuccess = False
        self.setWindowTitle('Login')
        self.setWindowIcon(QIcon(''))
        self.window_width, self.window_height = 600, 200
        self.setFixedSize(self.window_width, self.window_height)

        layout = QGridLayout()
        self.setLayout(layout)

        labels = {}
        self.lineEdits = {}

        labels['Username'] = QLabel('Username')
        labels['Password'] = QLabel('Password')
        labels['Username'].setSizePolicy(QSizePolicy.Policy.Fixed, QSizePolicy.Policy.Fixed)
        labels['Password'].setSizePolicy(QSizePolicy.Policy.Fixed, QSizePolicy.Policy.Fixed)

        self.lineEdits['Username'] = QLineEdit()
        self.lineEdits['Password'] = QLineEdit()
        self.lineEdits['Password'].setEchoMode(QLineEdit.EchoMode.Password)

        layout.addWidget(labels['Username'],            0, 0, 1, 1)
        layout.addWidget(self.lineEdits['Username'],    0, 1, 1, 3)

        layout.addWidget(labels['Password'],            1, 0, 1, 1)
        layout.addWidget(self.lineEdits['Password'],    1, 1, 1, 3)

        button_login = QPushButton('&Log In', clicked=self.checkCredential)
        layout.addWidget(button_login,                  2, 3, 1, 1)

        self.status = QLabel('')
        self.status.setStyleSheet('font-size: 25px; color: red;')
        layout.addWidget(self.status, 3, 0, 1, 3)
        

	def checkCredential(self):
        
        username = self.lineEdits['Username'].text()
        password = self.lineEdits['Password'].text()
        

        if username = "test" and password == "test":
            self.loginSuccess = True
        
        if self.loginSuccess == True:
            time.sleep(1)
            self.close()
            '''----->RETURN TO __MAIN__<------'''
        else:
            self.status.setText('Password is incorrect')

if __name__ == '__main__':
    # don't auto scale when drag app to a different monitor.
    # QApplication.setAttribute(Qt.HighDpiScaleFactorRoundingPolicy.PassThrough)
    loginSuccess = False
    app = QApplication(sys.argv)
    app.setStyleSheet('''
        QWidget {
            font-size: 25px;
        }
        QLineEdit {
            height: 200px;
        }
    ''')

    loginWindow = LoginWindow()
    loginWindow.show()

	

	'''----->IF login success then open main windows<-----'''

	
    try:
        sys.exit(app.exec())
    except SystemExit:
        print('Closing Window...')