I believe this is a pretty niche feature that not many people actually would want it. Even Joomla doesn't have such feature for their articles. If there are users who are interested in this feature, we'll definitely look into this.
I hope that you understand we do not want to bloat our code simply because only 2 - 3 users want such functionality. If this is needed, I would suggest that you hire a freelancer or contract us to customize this for you.
Thanks for understanding, appreciate it!