Append parameters to parameter server using YAML files

Hi, Is there a way to avoid overwriting parameters when being loaded from a launchfile using a YAML file? For example, I have two YAML files like the following: config1.yaml topics: - topic: topic1 type: geometry_msgs/Twist - topic: topic2 type: std_msgs/Empty config2.yaml topics: - topic: topic3 type: geometry_msgs/Twist - topic: topic4 type: std_msgs/Empty and want to have the 4 topics loaded under the `topics` parameter. I know that namespacing is the way it's normally done to separate parameters with the same name, but I'm looking for some other way. Thanks!