By adding the HASSio image as a zip file, as well as xz will allow ChromeOS to create the HASSio image via the ChromeOS recovery tools and simplify installation.
Etcher is not available for Chrome OS. Chrome OS recovery tool can only handle ZIP
I know. But if the images are provided as .xz you can use both Chrome OS or Etcher to create the SD card
You have to use convert the .xy to .zip on Chrome OS before you can create an SD image . You have to unzip the .xy to get the .img file then rezip to a .zip
The only tool available on Chrome OS computers is the Chrome OS Recovery tool that can only see .zip files . If the HassIO image was supplied as a ZIp it would work for Windows , Mac , Linux and Chrome OS
Did this ever happen? Or does anyone hat the image file as a zip file. I’m in this boat…slightly older device so I can’t use the playstore on it and I would like a .zip file.
No. I Think Chrome OS users are 0.01% of the user base 
There ore some online converters, but I never had any joy using them.
So I did this (assumes you have Linux enabled ) to burn image using Chromebook pixel
- Download your gz image to your chrome book.
- Drag the file to your Linux folder in the file manager.
- Open up a terminal.
- Now use GZip to uncompress the image
gzip -d hassos*
now go back into your file manager and right click the uncompressed image and select zip
this will produce a zip file.
Now use the chrome os recovery utilty to burn your sd card
as per instructions here
https://www.raspberrypi.org/documentation/installation/installing-images/chromeos.md
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Much better solution . In my defence Linux mode was not available then. Still it would be nicer if you could just download the ZIp
Agree with that!