Seems like that the values needed to change it are private in UniversalAdditionalCameraData. We get it that its not that hard to modify that code to fit our needs, but since this is for an asset store package we would rather not have the end users to manually modify stuff in the pipeline to make it work.
Sorry for not the answer you are looking for.
But I have been wondering about it, too.
It’s a shame that more than two weeks have passed without answer.
I’m waiting for the official Unity response about changing “Renderer Data” from script, too.