Draco Plugin reads undeclared Parameters with custom Pointcloud

[finostro]

I noticed that since the Draco plugin has parameters that depend on the Pointfield.
And when using having a field name that is not in the static list of declared parameters, then it complains that the parameter is not set .
However, when trying to set the parameter, ros2 disallows it because it has not been declared. (and also rqt_reconfigure does not show these params).

example when setting expert_attribute_types= true:
Publisher complains:

[component_container_mt-1] [ERROR] [1757098044.968232681] [point_cloud_transport]: Attribute data type not specified for intensity field entry.Using regular type recognition instead.
[component_container_mt-1] [INFO] [1757098044.968256082] [point_cloud_transport]: To set attribute type for intensity field entry, set /out/draco/attribute_mapping/attribute_type/intensity

on another terminal:

 ros2 param set /point_cloud_transport /out/draco/attribute_mapping/attribute_type/intensity GENERIC
Setting parameter failed: parameter '/out/draco/attribute_mapping/attribute_type/intensity' cannot be set because it was not declared

I tried to modify the draco_publisher.hpp code so that it declares the params when it gets the poincloud but it violates the constness of the
TypedEncodeResult encodeTyped(const sensor_msgs::msg::PointCloud2 & raw) const override;
function.

If I get a hint on how to fix it I'm happy to create a pull request.
Thank you for your help!