Comma-separated list of include dirs.
After defining the interfaces for C++ code that need to be available in Qml using InterfaceFiles, You need to specify the header files used by those interfaces using the --include-dirs option.
qmlprojectexporter --include-dirs "path/to/include_dir_1,path/to/include_dir_2" --outdir output-dir my_project.qmlproject
This option was introduced in QmlProject API 1.3 .
Available under certain Qt licenses.
Find out more.