Binary package “python3-sphinxcontrib.serializinghtml” in ubuntu jammy

sphinx extension which outputs “serialized” HTML files (json and pickle)

 This module contains two Sphinx builders, json and pickle, which produce
 serialized HTML code. It also provides an abstract class which one may use
 for serialization in custom formats.
 See the “Serialization builder details” section in Sphinx documentation for
 details on how the output looks like and how to configure it.