Sublime View: (1 column) | (1 column + 2 row)

Main.sublime-menu

[{
    "id": "view",
    "children": [{
        "id": "layout",
        "children": [{
            "caption" : "Custom 1",
            "command": "set_layout",
            "args":
            {
                "cols": [0.0, 0.5, 1.0],
                "rows": [0.0, 0.5, 1.0],
                "cells":
                [
                    [0, 0, 1, 2], [1, 0, 2, 1],
                                  [1, 1, 2, 2]
                ]
            }
        }]
    }]
}]