JSFiddle - React, Tailwind, and code Playground

HTML

<lable>Set1</lable>
<input type="checkbox" name="set_199[]" value="Apple" />
<input type="checkbox" name="set_199[]" value="Mango" />
<input type="checkbox" name="set_199[]" value="Grape" />

<input type="button" value="check" class="js-submit">

JavaScript

$(".js-submit").on("click", function(){
    var a = $("input[type='checkbox']:checked");
    var values = {};
    a.each(function(){
        var value = $(this).val();
        var name = $(this).attr("name");
        if(!values[name]) values[name] = [];
        values[name].push(value)
    });
    console.log(values)
});