Nesting Json items with Scrapy

I am having some issues in nesting items with scrapy with a json output.

below is what i am currently getting for my json output:

{

"Cruise": {
    "Cruiseline": [
        "CCL"
    ],
    "Nights": [
        "3 Night Bahamas ",
        "4 Night Western Caribbean ",
        "4 Night Bahamas ",
        "3 Night Bahamas ",
        "5 Night Western Caribbean ",
        "5 Night Eastern Caribbean ",
        "7 Night Western Caribbean ",
        "7 Night Southern Caribbean ",
        "6 Night Western Caribbean ",
        "7 Night Western Caribbean ",
        "8 Night Eastern Caribbean "
    ],
    "Per_Night": [
        "$169",
        "$179",
        "$289",
        "$349",
        "$359",
        "$389",
        "$389",
        "$409",
        "$424",
        "$519",
        "$909"
    ],
    "Low_Lead": [
        "$56/night",
        "$45/night",
        "$72/night",
        "$116/night",
        "$72/night",
        "$78/night",
        "$56/night",
        "$58/night",
        "$71/night",
        "$74/night",
        "$114/night"
    ]
}

The goal however is to get it to look like this:

{

"Cruise": {
    "Cruiseline": [
        "DIS"
    ],
        "Nights": [
            "3 Night Bahamas ",
        ],
        "Per_Night": [
            "$169",
        ],
        "Low_Lead": [
            "$56/night",
        ],
    "Cruiseline": [
        "CCL"
    ],
        "Nights": [
            "3 Night Bahamas ",
        ],
        "Per_Night": [
            "$169",
        ],
        "Low_Lead": [
            "$56/night",
        ]
}

My scrapy code is pretty simple:

def parse(self, response):
    item = CruiseItem()     
    item['Cruise'] = {}
    #item['Cruise'] = {"Low_Lead": "high"}
    item['Cruise']['Cruiseline'] = response.xpath('//title/text()').extract()
    item['Cruise']['Nights'] = response.xpath('//*[@id="brochureName1"]/text()').extract()
    item['Cruise']['Per_Night'] = response.xpath('//*[@id="interiorPrice1"]/text()').extract()
    item['Cruise']['Low_Lead'] = response.xpath('//*[@id="perNightinteriorPrice1"]/text()').extract()

    return item

I am just not sure how to get to where I want it to be.