[рони]

Малик,

function convert_to_json() {
    const checArr = arr => arr.filter(({
        checked
    }) => checked).map(({
        value
    }) => value);
    results = {
        lang_list: checArr([CustomCheck1,
            CustomCheck2,
            CustomCheck3,
            CustomCheck4
        ]),
        subd_list: checArr([CustomCheck5,
            CustomCheck6,
            CustomCheck7,
            CustomCheck8
        ]),
        SystemControl_list: checArr([CustomCheck9,
            CustomCheck10,
            CustomCheck11,
            CustomCheck12
        ])
    };
    let json = JSON.stringify(results);
    alert("results: " + json);
}