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Extending Blueprint Interface

I’m referring to my own thread

There’s no possibility to extend a blueprint interface.
I’d like to have an Item_Interface and a WeaponItem_Interface.
WeaponItem_Interface should inherit Item_interface.

Implementing them separately makes no sense.

I second this.
Also there are some blueprint interface inheritance, but i don’t understand how it works.

Because it is my use case and it has to do with the interfaces I mentioned:

You can expose a Class Type and select subclasses as a value:
988d96decf28e82e5e486cd5944e739456d608cd.jpeg

Item2.jpg
(Test extends Item)
But you cannot expose Interface Type and select classes implemeting it:
Item_I1.jpg

86d56302c252f09501f0529aac7515a49908bcf6.jpeg

Why is that so? Is there a reason for this? Is there a solution for this?

This would indeed be a very useful feature. That being said, I haven’t yet ran into a situation where I need it so I don’t know - is this possible with C++?