required property behaves differently from the big qt

// MyComponent.qml
import QtQuick
Text {
    required property int a
    Item {    }
}

// RequiredExperiment.qml <-- main qml file
import QtQuick
Rectangle {
    MyComponent {
        anchors.centerIn: parent
        text: "Qt for MCUs"
    }
}

C:/Users/81808/Downloads/RequiredExperiment/MyComponent.qml:4:5: error: Required property outside of a delegate
    required property int a 

// MyComponent.qml
import QtQuick
import QtQuick.Window
Text {
    required property int a
    Item {    }
}

// RequiredExperimentBigQt.qml <-- main qml file
import QtQuick
import QtQuick.Window
Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")
    MyComponent {
    }
}
 

11:55:40: Starting C:\Users\81808\Downloads\build-RequiredExperimentBigQt-Desktop_Qt_6_6_0_MinGW_64_bit-Debug\appRequiredExperimentBigQt.exe...
QQmlApplicationEngine failed to create component
qrc:/RequiredExperimentBigQt/MyComponent.qml:5:5: Required property a was not initialized
QML debugging is enabled. Only use this in a safe environment. 

import QtQuick
Rectangle {
    MyComponent {
        a: 1 // <--- initialize it
        anchors.centerIn: parent
        text: "Qt for MCUs"
    }
}
 

C:/Users/81808/Downloads/RequiredExperiment/RequiredExperiment.qml:5:9: error: Binding on read-only property
        a: 1