@KevinH, @DiapDealer,
Remember when I said qtwebengine was a problem for FSDG distributions in Linux-land? Apparently that's not the only place it is a problem.
In fact, I would venture to say that qtwebengine being built from chromium sources, it will be a problem getting qtwebengine on anything other than macOS, Windows, and glibc-using Linux distributions targeting 432-bit or 64-bit intel platforms.
I was recently chatting with some Void Linux people, who are apparently very dedicated and have dozens of patches to get webengine to build on the musl libc, alpine linux (another musl libc distribution) doesn't have it at all, and Debian only lists qtwebengine available for i386, amd64, arm64, armhf, and mipsel (no ppc support, for example).
So this also means OpenBSD does not have access to qtwebengine (there is a port, but it is marked as disabled and broken), NetBSD does not have access to qtwebengine (there is a port, but only in pkgsrc-wip, and I don't believe that really works either), and FreeBSD does actually have qtwebengine, surprisingly, but only by applying hundreds of patches and with a warning that it's so painful to update that it doesn't necessarily stay in sync with the rest of qt5.
It's an interesting pickle, to be sure.