diff --git a/struct.go b/struct.go
index 30054d0..219e23e 100644
--- a/struct.go
+++ b/struct.go
@@ -408,6 +408,15 @@ func MapFromString(s string) (map[string]any, error) {
 	return b, nil
 }
 
+func MapFromStringExt(s string) (map[string]any, error) {
+	var b map[string]any
+	if err := bson.UnmarshalExtJSON([]byte(s), true, &b); err != nil {
+		return nil, err
+	}
+
+	return b, nil
+}
+
 // MapIsSubset given two map[string]any m1 and m2 will determine if m1 is a subset of m2.
 // Only fields' name is evaluated not their values.
 func MapIsSubset(subset, superset any) bool {