In Japanese, there is a system called furigana, where the pronunciation of kanji is displayed above the characters. This is often provided for children or foreigners learning Japanese. In recent years, with the increase of foreign residents in Japan, it has become standard for documents aimed at them to always include furigana.

Currently, there seems to be no way to achieve this in QML.

On the other hand, in HTML it is possible, as shown in the article below:
https://style.potepan.com/articles/21845.html

For example:

<ruby>
  機<rt>き</rt>械<rt>かい</rt>工<rt>こう</rt>場<rt>じょう</rt>
</ruby> 

I tried this in QML, but it did not work. (furigana was supposed to be on top of kanji, not next to them)