Help Desk access Read-Only

Summary:

I am looking into the possibility of granting Read-Only access to HD Agents so they can have access to certain type of HD requests but not be able edit them. Can this be possible to achieve using Access Groups? Can anyone point me in the right direction please?

Content (please ensure you mask any confidential information):

As an agent I need to be able to add other agents as readers-only to the request

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):