https://arstechnica.com/gadgets/2022/03/steam-on-chromebooks-is-ready-for-testing-comes-with-steep-requirements/

After prematurely announcing that Steam on Chromebooks was ready for testing last week, Google is making the release official today. The alpha version of Steam on Chrome OS is currently available in the Chrome OS 14583.0.0 Dev channel, as announced via a post in Google's Chrome Developers Community.

Not all Chromebooks will be able to run Steam, however. Google said only the following machines can try the alpha: