We want to format all of our files at once and check that on correct formatting on CI. It would be helpful for our buildsystem to generate a "file" with all qml files as content.

This avoids a too large cmdline with all files as parameter as it is limited.

We use that mechanism for uncrustify:

/usr/bin/uncrustify -c uncrustify.cfg --replace --no-backup -q -F ./formatting.files

$ uncrustify --help
 -F FILE      : Read files to process from FILE, one filename per line (- is stdin).
...

https://github.com/uncrustify/uncrustify