thanks to the work the community does on porting the Chromium browser
to ppc64le, we can have also the qt5-qtwebengine library available.
Currently there are ~20 packages that are excluded on ppc64le due the
unavailability of the webengine.
My "talos" COPR repository  contains now the main qt5-qtwebengine
package, pyqtwebengine bindings for Python and also the qmapshack app.
Building calibre fails in a test, investigating now. If there are other
apps you would like to be made available, let me know.
The plan is to merge the ppc64le support into the official Fedora rpms,
but it can take some time and depends on support from the maintainers of
the QT stack.