I thought it through a bit and came up with the code below. It works for my block, only on the back-end because we’re just using PHP on the front-end.
if (is_admin()) { ?>
<script>
document.querySelector('.editor-post-title__input').addEventListener('input', (e) => {
var title = e.target.value;
document.querySelector('.SELECTOR-OF-ELEMENT-YOU-WANT-TO-CHANGE').innerHTML = title;
});
</script>
<?php }
