将数据从数组的一个字段复制到数组的另一个字段

I use a component (ZOO) with the CMS Joomla to create articles.

The articles have different fields (title, subtitle, text, links, etc.) and the datas are stored in database in a column named "elements" like this :

{

    "b7b99652-839b-4171-8b4b-54a20415e459":  {
        "0":  {
            "value": "datas i want to copy"
        }
    },
    "8e3a883d-ab97-4091-869e-6189c0450c85":  {
        "0":  {
            "value": "here i want to record the datas i want to copy",
            "text": "",
            "target": "1",
            "custom_title": "",
            "rel": ""
        }
    }
}

I would like to copy the value of b7b99652-839b-4171-8b4b-54a20415e459 inside the value of 8e3a883d-ab97-4091-869e-6189c0450c85

I know how to copy datas from one column to another with MySQL but here in don’t know how to do this.

I can't do it manually because i have more than 400 entries like this.