diff --git a/cflag/ext.go b/cflag/ext.go
index 4c34e8efe..219358b62 100644
--- a/cflag/ext.go
+++ b/cflag/ext.go
@@ -410,7 +410,7 @@ func (s *KVString) Get() any {
 
 // Data map get
 func (s *KVString) Data() maputil.SMap {
-	return s.SMap
+	return s.Init().SMap
 }
 
 // Set new value, will check value is right
diff --git a/maputil/data.go b/maputil/data.go
index 07008e78f..379657af5 100644
--- a/maputil/data.go
+++ b/maputil/data.go
@@ -223,6 +223,16 @@ func (d Data) Sub(key string) Data {
 	return nil
 }
 
+// Slice get []any value from data map
+func (d Data) Slice(key string) ([]any, error) {
+	val, ok := d.GetByPath(key)
+	if !ok {
+		return nil, nil
+	}
+
+	return arrutil.AnyToSlice(val)
+}
+
 // Keys of the data map
 func (d Data) Keys() []string {
 	keys := make([]string, 0, len(d))
diff --git a/maputil/smap.go b/maputil/smap.go
index bcc74cc5e..8905825b5 100644
--- a/maputil/smap.go
+++ b/maputil/smap.go
@@ -105,6 +105,20 @@ func (m SMap) Strings(key string) (ss []string) {
 	return
 }
 
+// IfExist key, then call the fn with value.
+func (m SMap) IfExist(key string, fn func(val string)) {
+	if val, ok := m[key]; ok {
+		fn(val)
+	}
+}
+
+// IfValid value is not empty, then call the fn
+func (m SMap) IfValid(key string, fn func(val string)) {
+	if val, ok := m[key]; ok && val != "" {
+		fn(val)
+	}
+}
+
 // Keys of the string-map
 func (m SMap) Keys() []string {
 	keys := make([]string, 0, len(m))