diff --git a/data/strimzi-kafka-operator/v0-45-0/custom_mapping.py b/data/strimzi-kafka-operator/v0-45-0/custom_mapping.py
index 0008b6da7..8f9bd9ed7 100644
--- a/data/strimzi-kafka-operator/v0-45-0/custom_mapping.py
+++ b/data/strimzi-kafka-operator/v0-45-0/custom_mapping.py
@@ -48,6 +48,12 @@ def from_original_schema(cls, original_schema: BaseSchema) -> Self:
             original_schema.path, original_schema.raw_schema, config_schema
         )
 
+    def __getitem__(self, key):
+        return self.underlying_schema[key]
+
+    def __setitem__(self, key, value):
+        self.underlying_schema[key] = value
+
 
 CUSTOM_PROPERTY_SCHEMA_MAPPING = [
     CustomPropertySchemaMapping(