LS uses WMI class to collect Windows Users https://learn.microsoft.com/en-us/windows/win32/cimwin32prov/win32-useraccount
LS uses VMware API to collect info about vCenter and ESXi and you can create feature request to add users info. May be LS add this. Usually it takes about 3-5 years.
LS uses SNMP to collect Printers, Firewalls, Switches info. So this devices have to give users info via SNMP but there are few devices can it. So LS will not add this functionality. You have create OID custom yourself.
LS uses SNMP to collect Storage info. But there is only basic info. New storages has REST API but LS will not add support them, IMHO. Because it requires a lot of developers and money.