BuddyPress.org

Try using bp_get_group_id().
If you can get the group id, then use groups_get_group_admins( $group_id ) to get the group admins.
Pull out the user ids of the group admins and use the ids to get the user data that you want.

NOTE: you should be asking LearnDash these questions.
By asking them here, you are asking volunteers to answer questions about a third-party premium plugin.
Therefore, you most likely won’t get much assistance here.