The path to the qmlproject file. its value corresponds to the first positional argument in the command line, See
If you don't specify any Qmlproject file as a positional argument,
qmlprojectexporter will just display the --help output and suspend operation.
Specify a .qmlproject file containing a Project as a root node.
qmlprojectexporter --outdir output my_project.qmlproject
This option was introduced in QmlProject API 1.3 .
See also qmlprojectexporter.
Available under certain Qt licenses.
Find out more.