Dialog group in subflow

Hi , I use dashboard2 nodes in subflows to have several kind of instances of the same layout either all in one DB2 group, or each subflow in its own group.
I d like to have possibilit to open a dialog group to edit some stuff individually for each subflow , but I could not get it to work. In the end, all the nodes which are part of the subflow but set to the dialog group, and not the one set globally as the subflow env variable, are repeated in the dialog group as many times as the number of subflow instances.

So for now I removed these specific nodes related to dialog group from the subflows, and handle them externally.
I wonder if someone has something a bit more efficient to handle this?

Thanks