we have all emulators bundled for every hardware platform we support, so likely you want to install an emulator that is not supported at Kodi/LE ?
I could find this emulator in Kodi: "Sega - Saturn (Beetle Saturn)", but not in Libreelec. After some long research, the only reason I found for it not to show was because this specific emulator only runs in 64 bit, hence the question.
I just deployed this version and struggled for quite a while trying to install a specific game emulator. Eventually, I realized this was not possible because Libreelec is 32 bit.