If ChromeOS is available for ARM processors - why can we not find or run in on the M series CPUs?

Does anyone know why ChromeOS is available for ARM CPUs in specific laptop models, but Chrome OS Flex does not support ARM yet? I was hoping to have a ChromeOS VM to tote around with me for testing things out at work in various scenarios without having to actually carry a Chromebook with me. I find it odd that the recovery tool from Google won't let you install anything other then x86_x64 when their OS is obviously compiled and able to run it... kind of a bummer - but hoping maybe knows of a way?