In Edit Fields screen check for Administrator username

Hello,

Please advise on the following issue:

In the installer, I have added an "Edit Fields" screen in which I want the user to enter the Administrator username, password and domain (if the user is a domain admin).

What I would like to do is validate whether the admin username that was introduced is part of the Windows Administrators group or not.
Is there a way to do this?

I know that I can get the user's SID and check that the username exists on the system, but I want to check if that username is an actual Administrator.


Another solution that I was thinking about is to integrate a Powershell code that verifies this. Is there a way to integrate and run a powershell code at run-time, like when pressing Next ?

Thank you,
Cosmin