[Feature request] Default values for vars

[nate-sys]

It would be nice to have default values that can be overriden if needed.

Here are some syntax/usage suggestions

menu http {
    test: {
        vars route="index", port=8080
        "make a test request" - "curl http://127.0.0.1:$port/$route"
    }
}

And the ui could look something like

value for route ("index"): 
value for port (8080):

[KnorrFG]

Good idea, It's on the todo list 👍