ls -lah /lib/x86_64-linux-gnu/|grep -i libQt5Core
-rw-r--r-- 1 root root 1.3K Apr 9 2020 libQt5Core.prl
lrwxrwxrwx 1 root root 20 Apr 9 2020 libQt5Core.so -> libQt5Core.so.5.12.8
lrwxrwxrwx 1 root root 20 Apr 9 2020 libQt5Core.so.5 -> libQt5Core.so.5.12.8
lrwxrwxrwx 1 root root 20 Apr 9 2020 libQt5Core.so.5.12 -> libQt5Core.so.5.12.8
-rw-r--r-- 1 root root 5.3M Apr 9 2020 libQt5Core.so.5.12.8
apt-cache search qt|grep default
qt3d-defaultgeometryloader-plugin - Qt 3D default geometry loader plugin
qt5-default - Qt 5 development defaults package
file gpgfrontend
gpgfrontend: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=8bc5bd7e72243f0332b83be64125e154fd92ea1f, for GNU/Linux 3.2.0, not stripped
Then it would be also easier for people to search apps in AppImage format at one place.