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1. Get the geoJSON File https://geodata.ucdavis.edu/gadm/gadm4.1/json/gadm41_DEU_4.json.zip if you need german cities
2. Convert it with https://products.aspose.app/gis/conversion/geojson-to-kml to kml
3. Search for the wanted city name in and copy the coordinates from into the file below.

KML values are:

• NAME is the name of the area
• ffA1CAA7 is the color of the border with opacity
• ddAED1B3 is the color of the outer field with opacity
• COORDINATES are the coordinates of innerBoundaryIs and are from geoJSON {geometries.0.coordinates.0.0} as {0}, {1} followed by a space or linebreak
  {0},{1},0
  {0},{1},0
  {0},{1},0
• do not touch the coordinates of outerBoundaryIs

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
    <Document>
        <Placemark>
            <name>NAME</name>
            <description><![CDATA[NAME]]></description>

            <styleUrl>#colors</styleUrl>
            <Style id="colors">
                 <LineStyle>
                    <color>ffA1CAA7</color>
                    <width>4</width>
                </LineStyle>
                <PolyStyle>
                    <color>ddAED1B3</color>
                </PolyStyle>
            </Style>

            <MultiGeometry>
                <Polygon>
                    <outerBoundaryIs><LinearRing><coordinates>
180,85 180,0 180,-85 
0,-85 
-180,-85 -180,0 -180,85 
0,85
</coordinates></LinearRing></outerBoundaryIs>
                    <innerBoundaryIs>
                        <LinearRing>
                            <tessellate>1</tessellate>
                            <coordinates>
                                COORDINATES
                            </coordinates>
                        </LinearRing>
                    </innerBoundaryIs>
                </Polygon>
            </MultiGeometry>
        </Placemark>
    </Document>
</kml>