If you repo synced to LinuxImageV2.7, meta-qt5 layer is already included. Which image did you exactly build and flash on Colibri iMX7? Did you build angstrom-lxde-image or did you build angstrom-qt5-x11-image as I recommended in another thread?
If you build angstrom-qt5-x11-image, the local.conf needs to only have this added
PACKAGECONFIG_FONTS_append_pn-qtbase = " fontconfig"
and if you build angstrom-lxde-image, the local.conf needs to have
IMAGE_INSTALL_append = " qtbase qtbase-plugins cinematicexperience liberation-fonts"
PACKAGECONFIG_FONTS_append_pn-qtbase = " fontconfig"
angstrom-qt5-x11-image will have the Qt libraries included which is not the case for angstrom-lxde-image as a result of which the required Qt libraries have to specified. Please check the image you are building.
One can also check for the presence of Qt libraries on the module with
ls /usr/lib/ | grep -i "libqt"