@Sai Kumar P try the below script, just an idea.
function onLoad() {
// Replace "text_area" with the ID of the multi line text variable
var element = gel('text_area');
// Add an event listener to the element to update the counter in real-time
element.addEventListener('input', function() {
var remainingChars = 200 - element.value.length;
// Replace "char_count" with the ID of the HTML element that displays the character count
gel('char_count').innerHTML = remainingChars + " characters remaining";
});
}
