Sure, you should be able to use something like this:
Connect-MgGraph -Scopes EntitlementManagement.Read.All
Import-Csv c:\files\userlist.csv | % { Get-MgBetaEntitlementManagementAccessPackageAssignment -Filter "target/objectid eq $($_.ID)" }
where the c:\files\userlist.csv CSV file should contain a column ID with the GUID of the user. If you want to use a property such as the UPN, you will have to resolve the value first to a GUID, as the resource does not support filtering by UPN.