You can use the /roleManagement/directory/roleEligibilityScheduleRequests
endpoint (or the corresponding Get-MgRoleManagementDirectoryRoleEligibilitySchedule
cmdlet) to list them: https://learn.microsoft.com/en-us/graph/api/rbacapplication-list-roleeligibilityschedulerequests?view=graph-rest-beta&tabs=http
Scoped assignments will show up with /administrativeUnits/blabla
value for the DirectoryScopeId
property.