<input id="che1" name="che1" type="checkbox" onchange="onChange('Hello world')">
<div class="innerHere"></div>
<script>
    function onChange(someText) {
        document.querySelector(".innerHere").innerHTML = someText;
    }
</script>

<input id="che1" data-text="Hello world" name="che1" type="checkbox">

document.querySelector("#che1").addEventListener("click", () => {
    var inp = document.querySelector(".innerHere");
    var someText = inp.getAttribute("data-text");
    inp.innerHTML = someText;
});