Karabiner rules to activate/deactivate Caps Lock layer using Ctrl + ESC

ctrl_esc_to_caps_lock.json

{
	"title": "Ctrl + ESC -> Caps Lock",
	"rules": [
		{
			"description": "Ctrl + ESC -> Caps Lock",
			"manipulators": [
				{
					"from" : {
						"key_code" : "escape",
						"modifiers" : {
							"mandatory" : [ "left_control" ],
							"optional" : [ "caps_lock" ]
						}
					},
					"to" : [
						{
							"key_code" : "caps_lock",
							"modifiers" : [ "left_control" ]
						}
					],
					"type" : "basic"
				}
			]
		}
	]
}