I didn’t know this page: https://developer.chrome.com/docs/extensions/reference/automation/
Basically, the API is available in chrome browser. So, it is probably for libraries running as part of JS on the browser. But maybe we can use it for Chrome OS automation since the API has https://developer.chrome.com/docs/extensions/reference/automation/#method-getDesktop as well.
I don’t have Chrome OS yet, but it would be interesting to integrate it with Appium. Would love to take a look when I get a Chrome OS machine.