They do have, but I understand it is experimental and not public. Some speculate that it is intended for Valve Deckard. https://gitlab.steamos.cloud/steamrt/st

They do have, but I understand it is experimental and not public. Some speculate that it is intended for Valve Deckard. https://gitlab.steamos.cloud/steamrt/steamrt/-/commit/5833faec9775d1d2a8ada09419e1690786af7839#8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d https://gitlab.steamos.cloud/steamrt/steamrt/-/commit/5833fa... For now, the Steam client needs to be run inside an x86 emulator.