Tree view for conversations

Can you please provide the option to view mails in conversation view not only on one single vertical level, but as a real tree with different levels of indentations? This would make it much easier to follow conversations in which recipients react to different mails in the same conversation. As far as I know, neither the new Outlook nor the new Thunderbird (version 115 and above) have this feature anymore, so it would be great if you can implement it.