I was about to comment to say that unless Valve is prepared to invest significant effort into an x86 -> ARM translation layer that's not going to happen but a quick search for "linux x86 to arm translation" led me to an XDA article[1] proving me wrong. The recently announced Steam Frame runs on ARM and can run x86 games directly using using something called FEX.
Now we just need to be as good as (or better than) Apple's Rosetta.
Apple Silicon actually has microarchitectural quirks implementing certain x86-isms in hardware for Rosetta 2 to use. I doubt any other ARM SoC would do such a thing, so I doubt third-party translation will ever get quite as efficient.
Now we just need to be as good as (or better than) Apple's Rosetta.
[1] https://www.xda-developers.com/arm-translation-layer-steam-f...