Haw to write "ExtendedData" to KML-file?

Haw to write "ExtendedData" to KML-file?

I need to create KML-file with text:

...

<ExtendedData xmlns:mis="www.dji.com">

<mis:useWaylineAltitude>true</mis:useWaylineAltitude>

<mis:heading>130</mis:heading>

<mis:turnMode>Auto</mis:turnMode>

<mis:gimbalPitch>0.0</mis:gimbalPitch>

</ExtendedData>

<Point>

<altitudeMode>relativeToGround</altitudeMode>

<coordinates>43.765366528,56.295119389,150.0</coordinates>

</Point>

...