Ace tern editor. Make own autocomplete properties for unknown value

[oh wait]

i have default.json file with properties. Example,

{ 

"!name": "test", 

    "Commit": { 

        "!doc": "test", 

        "!type": "fn(connectionName: string, k: string) -> object" 

        "default": { 

             "!doc": "test", 

              "z": { "!doc": "test" }, 

               "p": { "!doc": "test" }

     }

 }

In redactor

var t = 'string'; 

Commit.t.

and i need that autocomplete with 'default' properties appears after "t". So, if "Commit" dont have that property (in this case "t"), then properties 'z' and 'p' appear. 

how i can did it? 

thanks