Add header to QTreeView

How can I add headers (country, state, city) to a QTreeView

from PyQt6.QtWidgets import QMainWindow, QApplication, QTreeView
import sys
from PyQt6.QtGui import QStandardItem, QColor, QFont, QStandardItemModel

class StandardItem(QStandardItem):
def init(self, txt=“”, font_size=12, set_bold=False, color=QColor(0,0,0)):
super().init()
fnt = QFont(“open_sanse”, font_size)
fnt.setBold(set_bold)
self.setEditable(False)
self.setForeground(color)
self.setFont(fnt)
self.setText(txt)

class MainWindow(QMainWindow):
def init(self):
super().init()

    self.setWindowTitle("tree view test")
    self.resize(500, 300)
    
    treeView = QTreeView()
    treeView.setHeaderHidden(True)
    
    treeModel = QStandardItemModel()
    rootNode = treeModel.invisibleRootItem()
    
    america = StandardItem("America", 16, set_bold=True)
    california = StandardItem("California", 14)
    america.appendRow(california)
    texas = StandardItem("Texas", 14)
    america.appendRow(texas)
    
    okland = StandardItem("Okland", 12, color=QColor(155,0,0))
    sanfransisco = StandardItem("Sanfransisco", 12, color=QColor(155,0,0))
    sanjose = StandardItem("San jose", 12, color=QColor(155,0,0))
    
    california.appendRow(okland)
    california.appendRow(sanfransisco)
    california.appendRow(sanjose)
    
    austin = StandardItem("Austin", 1, color=QColor(155,0,0))
    houston = StandardItem("Houston", 1, color=QColor(155,0,0))
    dalas = StandardItem("Dalas", 1, color=QColor(155,0,0))
    
    texas.appendRow(austin)
    texas.appendRow(houston)
    texas.appendRow(dalas)
    
    canada = StandardItem("Canada", 16, set_bold=True)
    
    ontario = StandardItem("Ontario", 14)
    bc = StandardItem("British Columbia", 14)
    alberta = StandardItem("Alberta", 14)
    
    canada.appendRows([alberta, bc, ontario])
    
    rootNode.appendRow(america)
    rootNode.appendRow(canada)
    
    treeView.setModel(treeModel)
    treeView.expandAll()
    treeView.doubleClicked.connect(self.getValue)
    
    self.setCentralWidget(treeView)
    
def getValue(self, val):
    print(val.data())
    print(val.row())
    print(val.column())

app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()