Google added a screen capture ability to Chrome OS already, but it has been an awful experience so far. The current software lacks many features standard in the screen capture apps (like long recordings) and even requires the user to convert the file after recording to get all access to standard video features. But now that will hopefully be changing once Chrome OS 93 arrives to users as Google has revamped to app in a serious fashion and seems to have a quality screen recorder now.
This will be a major move for the platform as currently users need to use third party apps (often full of subscriptions) to record their screens on par with other built-in solutions. While the solution for capture screens on Chrome OS is still an odd process due to how dependent the OS is on its browser, the new solution seems to offer a much more user-friendly solution.
Sadly, Google seems to have completed the fix for this app, but it will not be released in Chrome OS 92 for some reason. If you are in dire need of a better screen capture option, then you may want to jump into the beta release channel on your Chromebook instead of the stable channel. Of course, you can always go down the third-party app route, but we would advise doing a bit of research first as many are lined with pay-walled features.