This is a memo on how to achieve double-sided ruby (furigana) in Word using python-docx.
You can try it from the following notebook.
https://colab.research.google.com/github/nakamura196/ndl_ocr/blob/main/python_docxを用いた両側ルビ.ipynb
An output example is shown below.

An input example is shown below.
<body>
<p>
私は
<ruby>
<rb>
<ruby>
<rb>打</rb>
<rt place="right">ダ</rt>
</ruby>
<ruby>
<rb>球</rb>
<rt place="right">キウ</rt>
</ruby>
場
</rb>
<rt place="left">ビリヤード</rt>
</ruby>
に行きました。
</p>
<p>
<ruby>
<rb>入学試験</rb>
<rt place="above">にゅうがくしけん</rt>
</ruby>
があります。
</p>
</body>
The program is still incomplete, but I hope it serves as a helpful reference.