I tried this:
EXTRA_BINFILES += $$PWD/log/myfiles.txt
EXTRA_OUT_FILES += $$OUT_PWD/log/
for(FILE,EXTRA_BINFILES){
QMAKE_POST_LINK += $$quote(cp $${FILE} $$EXTRA_OUT_FILES$$escape_expand(\n\t))
}
EXTRA_BINFILES += $$PWD/log/myfiles.txt
EXTRA_OUT_FILES += $$OUT_PWD/log/
for(FILE,EXTRA_BINFILES){
QMAKE_POST_LINK += $$quote(cp $${FILE} $$EXTRA_OUT_FILES$$escape_expand(\n\t))
}
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And also create subfolder log under built dir (manually create, not use command in .pro file)
Still not work 

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