Automating Subitem dependency

I have a repeating projects so it’s important for me to automate timelines.

Basically I created two automations:

  1. by changing the first items Timeline the other item timelines adjust automatically.
  2. by changing the first subitems Timeline the other item timelines adjust automatically.
    Screenshot, if anybody is interested.

The problem is that our projects are agile and sometimes dates change. It would not be a problem if I could link together Item and Subitem dependencies, but it’s not possible.

I saw this discussed in a few places and one year ago this was said to be implemented by Monday.com team. I cannot find solution for this, can anybody advise please?