I have the below json file

[
    {
        "n_id": 1,
        "n_key": "sdfvnifughsdfvnsdfvnsd",
        "entries": 7
    },
    {
        "n_id": 2,
        "n_key": "amfgjbongmikjmjegieojgem",
        "entries": 8
    },
    {
        "n_id": 3,
        "n_key": "fdsggjhndsjfsjinfjghbdpojgd",
        "entries": 10
    }
]

How can I sum up all the entries in the above json file and save it in a variable JSON_SUM ??

I have zero knowledge in working with a json file, can someone please help me. I want to use this in a bash script