convert the JSON to CSV using Bash script

Question

Input Json:

[
    [
        {
            "Instance": "i-123",
            "Name": "first",
            "InstanceProfile": "string1"
        },
        {
            "Instance": "i-456",
            "Name": "second",
            "InstanceProfile": "string2"
        }
    ],
    [
        {
            "Instance": "i-789",
            "Name": "third",
            "InstanceProfile": "string3"
        }
    ]
]

Output CSV:

Instance,Name,InstanceProfile
i-123,first,string1
i-456,second,string2
i-789,third,string3

I could'nt do this as there is additional square brackets before and after the actual list and the list is list of lists which is confusing.

Please assist.