Change Data of subclassed QAbstractListModel in Python and show in QML ListView

[childOfGod]

Hello,
I try to implement a GUI with QML and Python. For that, I already implemented an own model (subclass of QAbstractListModel) to be displayed in a ListView. Now I want to change some data of the model, in fact, I want to call other functions and then display the result of this functions in my GUI. I already read something about signals and slots in Qt and I tried to implement a setData() method, cause I read that this is necessary for the data of the model to be changed. Now the problem is, that I don't know how to connect the method in the model with the properties of the QML file, e.g. I want to change the text field inside the ListView but I can't get it.
Here is some of my code.
The QML File:

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    id: root
    visible: true
    width: 600
    height: 650
    title: "listview"



    ListView {
        id: listView
        width: 600
        height: 510
        //anchors.fill: parent
        model: _myModel

        delegate: Rectangle {
        id: bottleneck_rect
        height: childrenRect.height
        width: parent.width
        property alias label_rect: label_rect
        

        Rectangle {
            width: 290
            height: 50
            //color: "green"
            id: label_rect
            Text {
                id: label
                text: qsTr(model.label)
                font.family: "MS Shell Dlg 2"
                //font.family: "Inconsolata"
                font.pointSize: 14
                anchors.verticalCenter: label_rect.verticalCenter;

            }
            anchors {
                left: parent.left; leftMargin: 10
            }
        }
}

Rectangle {
    width: 600
    height: 50
    id: route_rect
    property alias mi_route_rect: measurement_info_route_rect
   
    Rectangle {
        width: 290
        height: 50
        id: label_route_rect
        Text {
            id: label_route
            text: qsTr("Route via")
            font.family: "Inconsolata"
            font.pointSize: 14
            //color: "red"
            anchors.verticalCenter: label_route_rect.verticalCenter

        }
        anchors {
            left: parent.left; leftMargin: 10
        }
    }

    Rectangle {
        property alias textroute: measurement_info_route
        width: 190
        height: 50
        id: measurement_info_route_rect

        Text {
            id: measurement_info_route
            text: "here"
            font.family: "Inconsolata"
            font.pointSize: 8
            visible: true
            anchors.verticalCenter: measurement_info_route_rect.verticalCenter

        }
        anchors {
            left: label_route_rect.right; leftMargin: 15
        }
    }

    anchors {
        bottom: listView.bottom;
    }
}

Button {
    id: details
    text: "Details"
    anchors {
        top: route_rect.bottom; topMargin: 40
    }
    onClicked: {
        route_rect.mi_route_rect.textroute.visible = !route_rect.mi_route_rect.textroute.visible;
    }

}


}
}

The Model mymodelqt.py:

#!/usr/bin/env python3
from enum import Enum

from PyQt5.QtCore import QAbstractListModel, QMetaEnum, QTimer, QModelIndex, QVariant, QObject, QThread, pyqtSignal, pyqtSlot


    
class Label:
    def __init__(self, label):
        super().__init__()
        
        self.label = label



class MyModel(QAbstractListModel):
    def __init__(self):
        super().__init__()
        
        self._labels = [
                             Label("1rstlabel"),
                             Label("2ndlabel"),
                             Label("3rdlabel")
                             ]
                             


    class Roles(QMetaEnum):
        LabelRole = 1
                             
    def rowCount(self, parent):
        if parent.isValid():
            return 0
        return len(self._labels)
        
        
    def data(self, index, role):
        if not index:
            return QVariant

        
        if role == self.Roles.LabelRole:
            return self._labels[index.row()].label
             
        else:
            return QVariant

    def roleNames(self):
        _label = "label".encode('utf-8')
        

        mapping = {
                   self.Roles.LabelRole: _label
                   }
        return mapping
        
    

    def setData(self, index, value, role) -> bool:
        if not index.isValid():
            return False
        
        if role == self.Roles.LabelRole:
            self._labels[index.row()].label = value
        
        return True
    
    
    textReturn = pyqtSignal(str, arguments=['txt'])
    
    @pyqtSlot(str) 
    def details(self, text):
        print("Clicked the button")   
        txt = text + " Jesus loves you"
        self.textReturn.emit(txt)  

           

and the main Python-file:

import sys


from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine


from mymodelqt import MyModel

if __name__ =="__main__":

   
    app = QGuiApplication(sys.argv)
    myModel = MyModel()

    engine = QQmlApplicationEngine()
    engine.rootContext().setContextProperty("_myModel", myModel)
    engine.quit.connect(app.quit)
    engine.load('qt-forum.qml')
    
    
    
    sys.exit(app.exec_())

I want to change the name of label, e.g. from 1rstlabel to 0label, but in QML I can't get the property label of the Text from outside the ListView. I read something about properties and aliases and tried to implement it and it works for things outside the ListView, you can see that if you try to click the button. I got the visible-property of the text to show and hide the text. But as I said I can't reach the properties inside the ListView to be able to modify them.
I appreciate your help, thanks for reading this long post and thanks in advance for your advice!