Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
application()
application(qt5-designer.desktop)
libcontainerextension.so()(64bit)
libcustomwidgetplugin.so()(64bit)
libqquickwidget.so()(64bit)
libtaskmenuextension.so()(64bit)
libworldtimeclockplugin.so()(64bit)
mimehandler(application/x-designer)
qt5-designer
qt5-designer(x86-64)

Requires :

libc.so.6()(64bit)
libQt5Core.so.5(Qt_5.9)(64bit)
libQt5Qml.so.5()(64bit)
libQt5Widgets.so.5()(64bit)
libQt5Quick.so.5()(64bit)
libQt5Network.so.5()(64bit)
rtld(GNU_HASH)
libQt5Xml.so.5()(64bit)
libGL.so.1()(64bit)
libQt5Core.so.5()(64bit)
libstdc++.so.6(GLIBCXX_3.4)(64bit)
libstdc++.so.6(CXXABI_1.3)(64bit)
rpmlib(PayloadIsXz) <= 5.2-1
libQt5DesignerComponents.so.5(Qt_5_PRIVATE_API)(64bit)
libQt5Widgets.so.5(Qt_5)(64bit)
qt5-qttools-libs-designercomponents(x86-64) = 5.9.7-1.el7
libQt5Core.so.5(Qt_5)(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
libQt5Gui.so.5()(64bit)
libQt5PrintSupport.so.5(Qt_5)(64bit)
libQt5Designer.so.5()(64bit)
/bin/sh
libstdc++.so.6()(64bit)
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
qt5-qttools-libs-designer(x86-64) = 5.9.7-1.el7
libpthread.so.0()(64bit)
libQt5Quick.so.5(Qt_5)(64bit)
libQt5QuickWidgets.so.5(Qt_5)(64bit)
libQt5QuickWidgets.so.5()(64bit)
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libQt5PrintSupport.so.5()(64bit)
rpmlib(PartialHardlinkSets) <= 4.0.4-1
libQt5DesignerComponents.so.5()(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libQt5Designer.so.5(Qt_5)(64bit)
libm.so.6()(64bit)
libQt5Xml.so.5(Qt_5)(64bit)
libgcc_s.so.1()(64bit)
libQt5Network.so.5(Qt_5)(64bit)
libQt5Gui.so.5(Qt_5)(64bit)

Content of RPM :
/usr/bin/designer-qt5
/usr/lib64/cmake/Qt5Designer
/usr/lib64/cmake/Qt5Designer/Qt5Designer_AnalogClockPlugin.cmake
/usr/lib64/cmake/Qt5Designer/Qt5Designer_MultiPageWidgetPlugin.cmake
/usr/lib64/cmake/Qt5Designer/Qt5Designer_QQuickWidgetPlugin.cmake
/usr/lib64/cmake/Qt5Designer/Qt5Designer_TicTacToePlugin.cmake
/usr/lib64/cmake/Qt5Designer/Qt5Designer_WorldTimeClockPlugin.cmake
/usr/lib64/qt5/bin/designer
/usr/lib64/qt5/bin/designer-qt5
/usr/lib64/qt5/plugins/designer/libcontainerextension.so
/usr/lib64/qt5/plugins/designer/libcustomwidgetplugin.so
/usr/lib64/qt5/plugins/designer/libqquickwidget.so
/usr/lib64/qt5/plugins/designer/libtaskmenuextension.so
/usr/lib64/qt5/plugins/designer/libworldtimeclockplugin.so
/usr/share/applications/qt5-designer.desktop
/usr/share/icons/hicolor/32x32/apps/designer-qt5.png