How to install ament_cmake_python??

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From this tutorial I discovered that the following package is available:

ament_cmake_python

but doing:

ros2 pkg create --build-type ament_cmake_python test_interfaces

I get the following error:

ros2 pkg create: error: argument --build-type: invalid choice: 'ament_cmake_python' (choose from 'cmake', 'ament_cmake', 'ament_python')

How do I get the ament_cmake_python package working? The link to github doesn't contain any installation instruction.

Thanks