JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li class="one">A</li>
    <li class="one">A</li>
    <li class="one">A</li>
    <li class="two">B</li>
    <li class="two">B</li>
    <li class="two">B</li>
    <li class="three">C</li>
    <li class="three">C</li>
    <li class="three">C</li>
</ul>

JavaScript

var stringsToStringify = $('.one, .two'),
    stringArray = {}

    $.each(stringsToStringify, function (i, v) {
        console.log(i + ' ' + $(v).html())
        stringArray[i] = v
    })

    console.log(stringArray)
    var jsonString = JSON.stringify(stringArray)
    console.log(jsonString)
    console.log(JSON.parse(jsonString))