Is it possible to make the comments to be mirrored/connected between same item on two boards? I do not see such option, but there is a column text.
Hey!
It is possible to mirror a text column between boards using the connect boards column and mirror column. That said, if you’re referring to the updates section, I am afraid this isn’t currently supported. That said, it is currently on our long-term roadmap and you can check out the existing feature request here → Shared or mirrored updates for connected items. Stay tuned for updates in the future!
Hello @BHL ,
Welcome to the monday community! 
Bianca is absolutely correct.
I would like to add that you can use the Conversations App to see the updates between all connected items.
Hope this helps!
Giannis, Implementation Consultant at thespelas.com