Debian ships Chromium on many architectures for a long time now, apparently. I never tried it outside of x86_64, so I can't say how usable it is. What am I missing? Is this about V8 JIT and widewine? Although those must be already supported on chromebooks, so I don't know.

Lists of architectures on oldstable (bookworm): amd64, arm64, armhf, i386, ppc64el

https://packages.debian.org/bookworm/chromium

From where I stand it seems they enabled a build architecture for Chrome, but I don't think this required a lot of porting effort. Kudos for the official support though.

It's just about their branded closed build, not even about V8 JIT which was there already.