Can I update the Post process lens within blueprints?

Hi I would like to update the Chromatic Aberration setting on a post process volume from within a blueprint. However I cannot find any way of doing this? Does anyone know how?

Like this:

You have to click on the graph background and find ‘make postprocess settings’. Then in the details you have to choose what pins you want to see on the node:

305517-chrom.jpg

Then you pull a pin from your PP reference and find the ( very vaguely named ) ‘set settings’.

The better way will be Set Members.
Explained here: Setting Post Processes in Blueprint (NEW WAY??) - Rendering - Unreal Engine Forums