Export multiple layers in QGIS as .kml files

Let's assume that you want to export multiple layers in QGIS as a single kmz file. The first step is to read the current project layers:

python
# Reading layers
layers = QgsProject.instance().mapLayers().values()

At this point, you can iterate through the layers and export those that are selected (check-marked):

python
# Printing visible layer's name
for layer in layers:
    name = layer.name()
    if QgsProject.instance().layerTreeRoot().findLayer(layer).isVisible():
    print(output_layer)

Now, you can transform each layer into a .kml:

python
from qgis.core import QgsVectorFileWriter, QgsVectorLayer
from PyQt5.QtCore import QSettings
from qgis.core import *
from qgis.utils import qgsfunction

# Reading layers
layers = QgsProject.instance().mapLayers().values()

# Transforming selected layers into KML's
for layer in layers:
    name = layer.name()
    if QgsProject.instance().layerTreeRoot().findLayer(layer).isVisible():
        output_layer = r"D:/Desktop/" +  name + ".kml"
        QgsVectorFileWriter.writeAsVectorFormat(layer, output_layer, "utf-8", layer.crs(), "KML", symbologyExport=QgsVectorFileWriter.FeatureSymbology)

If you run the script, you'd generate a bunch of .kml files. But it would be nice to combine the files into a single .kmz. You can do it manually by opening the whole group of files with Google Earth and exporting it as a single .kmz. However, it would be better to do it using the same script. I don't know how to do it yet. 😅

If you have any ideas on how to compress the files into a single .kmz using Python, it would be really helpful.