Qt user has following suggestion:

"

QtWebEngine module comes with resources directory and QtWebEngineProcess.exe file as well as DLLs.
The document says you can customize the location of those resources and process files:
https://doc.qt.io/qt-6/qtwebengine-deploying.html
However, the deployment tool for Windows, windeployqt does not support option to customize to copy those files and you have to manually move files if you use custom folders for webengine files.
It would be nice to have command line option to specify path for those files._

"