Directory View using Treeview and Folderlistmodel

[tuno]

I want to create Directory view which use treeview for structure and folderlistmodel to fetch folderslist. It contains dropdown button when click it shows list of corresponding subfolders in treeviews child. But don't know how to add subfolders to child of treeview.

Im using Qt 5.15.2

My code for folderview.qml is here

import QtQuick 2.15
import QtQuick.Layouts 1.15
import QtQuick.Controls 1.4
import QtQuick.Controls.Styles 1.4
import Qt.labs.folderlistmodel 2.1
import QtQuick.Studio.Components 1.0

Item {
    width: 500
    height: 416

    TreeView {
        id: treeView
        width: parent.width
        height: parent.height
        frameVisible: false
        headerVisible: false
        backgroundVisible: false
        style: TreeViewStyle {
            itemDelegate: Component {
                Item {
                    CFolderExpBtn {
                        id: dropdown
                        anchors.left: parent.left
                        anchors.leftMargin: -15
                        anchors.verticalCenter: parent.verticalCenter
                        checkable: true
                        scale: 0.6
                        //visible: model.hasChildren(styleData.parent)

                    }
                    SvgPathItem {
                        id: icon
                        y: -7
                        width: 40
                        height: 40
                        anchors.leftMargin: -10
                        anchors.left: dropdown.right
                        fillColor: "#ffe705"
                        path: "M 8.5 8 C 6.019 8 4 10.019 4 12.5 L 4 18 L 16.052734 18 C 16.636734 18 17.202344 17.793922 17.652344 17.419922 L 23.5 12.546875 L 19.572266 9.2734375 C 18.586266 8.4524375 17.336734 8 16.052734 8 L 8.5 8 z M 27.644531 13 L 19.572266 19.724609 C 18.585266 20.546609 17.336734 21 16.052734 21 L 4 21 L 4 35.5 C 4 37.981 6.019 40 8.5 40 L 39.5 40 C 41.981 40 44 37.981 44 35.5 L 44 17.5 C 44 15.019 41.981 13 39.5 13 L 27.644531 13 z"
                        scale: 0.50
                        strokeWidth: -1
                    }

                    Label {
                        anchors.left: icon.right
                        anchors.leftMargin: 5
                        anchors.verticalCenter: parent.verticalCenter
                        font.family: "Montserrat"
                        color: "#ffffff"
                        font.pointSize: 9
                        elide: styleData.elideMode
                        text: styleData.value
                        //                        MouseArea{
                        //                            onClicked:
                        //                        }
                    }
                }
            }
            rowDelegate: Component {
                Rectangle {
                    color: styleData.selected ? "#303030" : "#202020"
                    height: 30
                }
            }
        }
        FolderListModel {
            id: folderModel
            showFiles: false
            folder: "file:///C:"
            nameFilters: ["*"]
            showDirs: true
        }
        model: folderModel
        TableViewColumn {
            id: tableViewColumn
            title: "Directory"
            role: "fileName"
            width: 298
            movable: false
            resizable: false
        }
    }
}

Please help me with this.
Thank you