IMHO this is a wonderful idea! If I could, I'd +1 it.
AFAIK the only way to signal something to cartridges during add is using env vars, and there is not good way to represent those vars in a GUI.
It's not used today - it was originally intended for use by the UI (so that a cart could expose attributes that the UI would then let the user pick). We never got to the point to implement it though.
----- Original Message -----
> There is a "Cart-Data" section in manifest.yml and I performed a try to find
> out where is this data used. I found no explanation in documentations as
> well as I was not able to find what it is used for in source code.
> However I can see that this section exists in embedded cartridges. Can anyone
> explain what is it needed for, please?
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