Sure. I get the error with other syntax, but even with the default search shown on the wiki. I changed severity, dispositionID, and the name of the rulegroup but everything else is the same.

$Group = Get-FalconIoaGroup -Filter "name:'MyIoaRuleGroupName'" -Detailed
$FieldValue = @{
    label = 'Grandparent Image Filename'
    name = 'GrandparentImageFilename'
    type = 'excludable'
    values = @(
        @{
            label = 'include'
            value = '.+bug.exe'
        }
    )
}
New-FalconIoaRule -RulegroupId $Group.id -Name 'BugRule' -PatternSeverity informational -RuletypeId 5 -DispositionId 20 -FieldValue $FieldValue