Expression in function node

Questions
#1

How can I put a variable/expression in the function node?

{{$json[“email”]}} - It does not work

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#2

You will need to escape out of the code I believe or use handlebars to reference the node.

#3

I’m a layman at this, Can you give me an example of how to replace the information:

-OPERATIONS-
-MAP-
-FILE-
-CONFIG-

in the function node?