Delivery node attributes through config.json?

In order to genericize my build_cookbook (i.e. build process is the same between pipelines, just a few variables need to change), it’d be nice if I could just set some node attributes via the .delivery/config.json file. It’s obviously not hard to store some JSON config in a file along with the repo that’s being built and pull that in in the recipes but it would save a few steps if I could just specify some node attributes though config.json.

It’s not documented anywhere but I did figure out that anything you put in config.json will be available under node['delivery']['config']!