Browser Notifications
To allow Google Chrome notifications click the "view site information" icon located next to the website URL and toggle the Notifications icon on.
Device Notifications
To configure push notifications in the MacOS system click the Apple icon located at the top left corner of the screen and go to System Settings...
In the search bar please type Notifications and select the option named Notifications settings
Scroll down until you find Google Chrome and click on the Google Chrome option. To enable notifications turn on the toggle and select the Alerts option as shown in the image below.
You can now receive push notifications in your computer.