Using Rest API to GET attributes like Manager, Title

Hi there, I am new to this community and am using what I believe is a very old version of ADManager Plus (Version 7.0, Build 7066) on-prem.

I need to pull user attributes out of ADManager Plus for a custom integration. I am able to use the <URL>/RestAPI/SearchUser? code to get a standard set of attributes:

http://<SERVER:PORT>/RestAPI/SearchUser?domainName=<MYDOMAIN>&AuthToken=58f07db1-4054-48f5-b098-xxxxxxxxxxxx&startIndex=1&range=1000

returns these user attributes:

"LOGON_NAME","EMPLOYEE_ID","INITIAL","LAST_NAME","DOMAIN_NAME","FIRST_NAME","DISPLAY_NAME","OU_NAME","CITY","EMAIL_ADDRESS","SID_STRING","OBJECT_GUID","MOBILE","SAM_ACCOUNT_NAME"

But can I customize the attribute fields it returns? At least I need to add a couple of user attributes that it is not returning: Manager, Title. I know these attributes exist because they are in one of our custom reports.

I have tried specifying the fields to return similar to how i've done it with other Rest API's, but it still just dumps out this standard set of attributes.

Alternatively, can I use the API to run a report? We have a custom report that has everything I need. I just need to be able to have it download as a CSV without manually having to do it. (i.e. via command line script like Powershell. I use the Invoke-Webrequest functionality a lot and it has worked quite well with Rest API calls from other applications.)

Any help would be greatly appreciated. Thank you!

Eric