This feature is already built-in on it, but it's still on experiment flag. You need to activate it to enable this feature.
To activate this feature, open your chrome and type this on address bar ;
The experiment page will appear
Now use "find in page" menu on chrome and type
Enable offline pages
There you'll find an option to enable save the page offline
Enabled as saved pages
As soon as you're done with your choice, notification will appear on the bottom to tell you to relaunch the chrome to take effect.
Press it and the option save as offline page will available.
It will work as the way you saved as bookmark. But it will goes offline, and won't sync with your Google account.
You can find the saved pages along with the bookmarked pages option for later reading.
Ok, this conclude the guide for now.