The instancer tool is a command line application that reads an instancing table in the XML format defined by FileInstancing, and converts it to a format that can be directly mapped to memory.
To convert the file instances.xml and save the result in instances.xml.bin:
$ instancer instances.xml
To convert the file infile.xml and save the result in outfile.bin:
$ instancer infile.xml outfile.bin
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https://doc.qt.io/qt-6.2/qtquick3d-tool-instancer.html