They've done that with their Steam Link apps in 2019: https://www.polygon.com/2019/3/14/18266000/steam-link-anywhe...
The initial pairing has to be done on lan I believe, but will work afterwards through Steam. I remember trying it with a Raspberry Pi even. Steam itself will also work as a client and not require the initial pairing setup.
They've done that with their Steam Link apps in 2019: https://www.polygon.com/2019/3/14/18266000/steam-link-anywhe...
The initial pairing has to be done on lan I believe, but will work afterwards through Steam. I remember trying it with a Raspberry Pi even. Steam itself will also work as a client and not require the initial pairing setup.