How do I unify a string with a variable of type string on data in local storage?

Please, I need someone help. I realy don't know how to make it.

I tryed with JSON, XML, Functions, ",", "+"; and more. I'm tired to do not find a soluction.

Repeating the question:

How do I unificate in a local storage a string and a variable, type string?

Var & "string"

construct.net/en/make-games/manuals/construct-3/project-primitives/events/expressions

Thanks