I have this json example, that i show it to the user in the GUI with textarea. is there any way with a button click for example to change only the third key value for example to "fourth value" without changing the whole json? maybe is there a way to dynamucally build the json when reading it from file to the textaera in a way that it will be easy to acceess any key and change it's value?

{
    "first_key": "firs_value",
    "second_key": "second_value",
    "third_key": "third_value",    
    "tests": 
    [
        { 
            "object_1_a": "a",
            "object_1_b": "b"
            },
            { 
            "object_2_a": "a",
            "object_2_b": "b"
            }
    ]
}