What is "right to be heard" mean? For me it usually means employees speak their concerns with management, and management is receptive enough (ie they care about employee retention) that if something is really bad they hold a Q&A session. Maybe act on it.
I'm an empowered, high-demand employee in a high demand industry. If management doesn't want to hear about my concerns, that's fine and they can say so. I'll find another employer in less than a week.
Edit: to give a more concrete example, my employer was in talks to write software for client X, a corporation well known for being Bad People™️. A bunch of employees came forward that they didn't want to do business with client X. Management discussed it thoroughly with these employees, hosted public roundtables, etc. I wasn't part of this discussion so I can't say the outcome, but yes the employees who cared demanded a right to be heard, because often that's why we work for progressive employers in the first place.