Subflow with environment variable, want to also pass a message payload

Third party integrations Node-RED
1

I have a subflow that has a call service node, and the subflow creates a environment variable for a message. Data field below in json expression:

{ "message":$env('message'), "title":$env('title') }

now I also want to pass into the message json a payload variable. How do I write that json so that it includes the $env and {{payload}}?

2

Assuming you are working with strings and wish to concatenate:

{ "message": $env('message') & payload,  "title": $env('title') }

J: expression is JSONata which is a programming language, so this will only work when using J: and not { } option for the Data field object.

3

Thank you!