How to add Chrome extensions with via Group Policies

After installing chrome on your Terminal Server or the managed computers you need to download the templates for google chrome.

Then import the ADM file through MMC

Under Computer configuration > Administrative Templates > Classic Administrative Templates (ADM) > Google > Google Chrome > Extensions > Configure the list of force-installed apps and extensions
Use this syntax to add extensions:

ExtensionID;https://clients2.google.com/service/update2/crx

Example: to add RDP extension to Google Chrome

gbchcmhmhahfdphkhkmpfmihenigjmpp;https://clients2.google.com/service/update2/crx