How to change node settings in one place

[tb19-nr]

Regarding my point 2, "How to supply settings to nodes directly in the node editor input?"

Is there a way to get an expression working like shown below in recent NR versions (v4 and up)?

I created a topic regarding this "expression" type of syntax in node editors, not much response back then.

Support ${msg.foobar} for dynamic input in node editor

Hey Guys! o) It seems we can use env vars to set node-properties, like described here: [https://github.com/node-red/node-red/wiki/Design%3A-Using-environment-variables] Nice, but ENV vars only? Wot? o) Aren't global/flow context vars and message objects the first class citizens in node-red? In my flows I'd like to configure node settings in one place, like email-hostnames, mqtt-prefixes, ip-addresses, filesystem-paths etc. Right now I need to pick dozens of nodes and edit them manually afte…

I also read about JSONata support in more recent versions, but failed to find a single example in the docs and this forum about where these JSONata expressions can be used and IF they can be used in any node editor (which would solve my problem!).

Thank you! o)

ps: Side topic question:
What does "Environment Variable" mean in Node-Red context? An "Environment Variable" for me, is something I set on OS or process level, like "PATH". Is this the kind of variables Node-Red is talking about, when it says "environment variable" in the docs or is it referring to some javascript / nodejs / flow context variables? I don't get it! o)