terminator/layout-files-examples/2-3-grid.json

{
	"tab1": [
		{
			"children": [
				{
					"command": "bash"
				},
				{
					"command": "bash"
				},
				{
					"command": "bash"
				}
			]
		},
		{
			"children": [
				{
					"command": "bash"
				},
				{
					"command": "bash"
				},
				{
					"command": "bash"
				}
			]
		}
	]
}