How to access users from the "group picker" field (for input to "for each" loop of a jira rule)?

[Manju]

Hi everybody,

We want to loop through a list of Jira users in our automation rule and are using a custom field of type "Group picker (single group)" to use a jira group as the set of users (which will be used in our foreach loop).

I checked the REST API (https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-groups/#api-rest-api-3-group-member-get) as well as the common documentation and couldn't find an answer.
Is there any way to use a group as an input to a smart value in an automation rule to loop through the list of users (of that group)? If yes, how do I access this set of users?
From what I could see, I could only access the fields "name", "groupId" and "self" of my custom field "Group picker". How do I access the users of my group of this group picker field? Thanks in advance!