Hi,
This is an old thread, but I am interested if there is a solution. On my side, I wanted to be able to run Black Nut cloud gaming.
However, since your libreELEC is most probably running on a ARM board (Raspberry Pi, ...), it is impossible to run an x86 AppImage anyway 
The solution could be to emulate an x86 environment with qemu, but I guess it would impact performances.
Any idea guys?
Cheers