Not a role, but you can add people or groups into spaces with read-only access. Have a look at the space permissions, you'll see a swathe of permissions that you do not need to grant (for read-only, tick the first box for "can use" box only, leaving add/edit, delete, attach etc off)
Note that you may have an access scheme that allows everyone more access, you will need to consider reducing that access.
Hi All! We’re excited to share the launch of an announcement banner that lets Jira site administrators communicate directly to their users across their Jira Cloud instance. ...
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