Get form state of 'parent' form inside a relationship

function fieldVisibility(string $fieldKey): Closure
    {
        return function (callable $get) use ($fieldKey) {
            $settings = app(RoadworksSettings::class);
            $applicationType = $get('type');
            $applicationTypeKey = Str::slug($applicationType, '_');
            return $settings->fieldConfigurations[$applicationTypeKey][$fieldKey]['visible'] ?? true;
        };
    }