A new commit found in the Chromium Gerrit suggest that eSIM support for Chrome OS is in the pipeline. The commit is codenamed Project Hermes and while very little detail is in the commit about what exactly this would look like, it explicitly calls out eSIM support for the platform, allowing for cellular network support natively in devices.
Hermes is the codename for the project of implementing eSIM support for Chrome OS. Hermes will be responsible for delivering messages between devices with eSIM chips and carrier servers through profile downloads as well as service discovery for new carriers.
This could allow for an “always on” Chromebook that, in theory, could put it head-to-head against Microsoft with their always on Windows 10 laptops.