change QoS settings via YAML launch file

edit

I would like to change the QoS settings of a topic via a YAML launch file.

I can read the QoS settings for the /parameter_events topics via:

  ros2 param get <node> qos_overrides./parameter_events.publisher.reliability
  String value is: reliable

but ros2 param dump will not show me qos_overrides for other topics. Trying to change the QoS of a topic manually will only result in cannot be set because it was not declared.