i know that there is already a Steamlink feature request, but this seems to work only on rpi (not even 4th gen). The original moonlight development seems to run on almost any platform (Moonlight Game Streaming: Play Your PC Games Remotely)
I would love to see a come back of the Moonlight Addon, because Games are still the missing link for KODI to become the perfect media center.
I offer my full support for testing purposes. I own a PC (Win10 64bit) running a Nvidia 1050GTX as a server and various different plattforms of media players (rpi 2b, 3a, 3b, 3b+, odroid c2, intel nuc 2. gen) running libreelec.