My team asked me for solution described here. Unfortunatelly, every answer is from 2012. What is more, we are using JIRA Cloud.
According to my JIRA Admin, it is not possible to overwrite code in JIRA Cloud in way which is described in @Henning Tietgens's comment.
Is there any possibility to apply solution like this on JIRA Cloud?
Not a nice thing to do, duplicate information like that, so there's nothing available off-the-shelf and you'd have to do it yourself.
Your admin is correct in that you can't put custom code like that on Cloud.
The only think I can think of is some sort of external script that watches the sub-tasks and pokes the parents - running externally and both over REST (it could become far too large a thing to do quite quickly, so I wouldn't recommend it)
I think a better option would be to look at why your users think they want this - it sounds broken to me.
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