No, it’s not possible. Discourse isn’t meant to be used as a threaded discussion platform, so we don’t support this on a fundamental level (some justification here Web Discussions: Flat by Design).
It is fairly easy to do the opposite and hide the expandable sections with CSS so you’re not seeing the duplicate content (this would go under admin > customize > themes > edit CSS/HTML > desktop > CSS).
a.reply-to-tab,
.post-controls button.show-replies {
display: none;
}