Currently we have a smart value for capturing AffectedServices Change Approver Users via : issue.affectedServices.changeApprovers - Returns the account ID of all change approvers of the issue's services. Can be combined with other user-related smart values. 

However there is no Smart Value present when the Approvers are a Group like : 

{{issue.affectedServices.changeApproversGroups }} 

Suggestions to introduce this ability as one of the use cases are as highlighted here : copy Approver Groups from Affected Services to a custom field of groups type in order to use in JSM approvals

We provide the ability to have Approval Groups with workflows and hence introducing smart values for Affected Services Approval Groups makes a symmetry in operation and provides more leverage for customers to utilise the features in much more uniform manner between Features and Options of Jira.