I think you'll have to build out an attribute object and use Update-NcVol for this... Something like:
$q = Get-NcVol -Template
Initialize-NcObjectProperty $q VolumeIdAttributes
$q.VolumeIdAttributes.Name = "<VOLUME>"
$q.VolumeIdAttributes.OwningVserverName = "<SVM>"
$a = Get-NcVol -Template
Initialize-NcObjectProperty $a VolumeSpaceAttributes
$a.VolumeSpaceAttributes.IsSpaceReportingLogical = 'true'
$a.VolumeSpaceAttributes.IsSpaceEnforcementLogical = 'true'
Get-NcVol -Query $q
Update-NcVol -Query $q -Attributes $a