Overview
I tried out Gatsby CETEIcean, created by Raffaele Viglianti.
https://github.com/raffazizzi/gatsby-ceteicean-workshop
Prototype Site
The following is the prototype site. I have added several customizations, including MUI, vertical text display, and links to RDF data.
https://nakamura196.github.io/gatsby-ceteicean-workshop/

The TEI/XML files from the “Koui Genji Monogatari Text DB” are used as the data source.
https://kouigenjimonogatari.github.io/
Source Code
The source code including the customizations can be found at the following link.
https://github.com/nakamura196/gatsby-ceteicean-workshop
Summary
Using Gatsby CETEIcean, it seems possible to efficiently develop publishing environments for TEI/XML files.
I hope this serves as a helpful reference.