Earlier this year code commits showed up in ChromeOS that showed Google was adding support for 'AltOS.' New commits now show that the alternative operating system is likely to be Windows 10, but feasibility for the average Chromebook is questionable.
https://www.notebookcheck.net/Chromebooks-likely-to-get-Windows-dual-boot-support-but-it-might-not-be-feasible-for-many-devices.322880.0.html