if/else if equivalent for qmake/pro Qt file

I sometimes have to write qmake pro file like this:

QMAKE_EXTRA_TARGETS += activate

macos {
    clear_cache.commands += defaults write io.delille.$$TARGET activated 1;
}

win32 {
    clear_cache.commands += another working command;
}


linux {
    clear_cache.commands += echo unsupported;
}

ios {
    clear_cache.commands += echo unsupported;
}

Is there a way to have avoid listing all unsupported plateform in a simpler way like most language allow if if/else if statement?