So I got this class to truncate text but it's fixed, I want to to make more dynamic. I want to pass the length of text I want to truncate and make it work with multiple elements. I'm a newbie in JS classes so it's a but confusing for me right now. thank you in advance.

class readMore {
  constructor() {
    const end = 300;
    this.content = '.readmore__content';
    this.buttonToggle = '.readmore__toggle';
  }
  initiate() {
    this.setNodes();
    this.init();
    this.addEventListeners();
  }
  setNodes() {
    this.nodes = {
      contentToggle: document.querySelector(this.content),
    };
    this.buttonToggle = this.nodes.contentToggle.parentElement.querySelector(this.buttonToggle);
  }
  init() {
    const { contentToggle } = this.nodes;
    this.stateContent = contentToggle.innerHTML;
    contentToggle.innerHTML = `${this.stateContent.substring(200, `${end}`)}...`;
  }
  addEventListeners() {
    this.buttonToggle.addEventListener('click', this.onClick.bind(this));
  }
  onClick(event) {
    const targetEvent = event.currentTarget;
    const { contentToggle } = this.nodes;

    if (targetEvent.getAttribute('aria-checked') === 'true') {
      targetEvent.setAttribute('aria-checked', 'false');
      contentToggle.innerHTML = this.stateContent;
      this.buttonToggle.innerHTML = 'Show less';
    } else {
      targetEvent.setAttribute('aria-checked', 'true');
      contentToggle.innerHTML = `${this.stateContent.substring(200, `${end}`)}...`;
      this.buttonToggle.innerHTML = 'Show more';
    }
  }
}
const initReadMore = new readMore();
initReadMore.initiate();