Overhanging roof balcony?

Hello,
my first post in this forum, so first of all: hello everyone! I am inexperienced, so please excuse me if I say/ask nonsense.

We are currently planning the attic conversion of an old building (city villa, built in 1895). There is a "side wing" for the staircase (only 2.10 m deep, 6.80 m wide). Parts of the facade and staircase are protected as historic monuments, but not the roof, where interventions have already been made several times (old dormers removed, roof windows installed).

The sloping ceilings begin after an 80 cm knee wall on the 2nd upper floor, where the actual apartment is to be created. The question is what can be made of the attic above. Ceiling height in the attic reaches 2.50 m directly under the ridge, roof pitch is 45 degrees, so there is not much space.
The idea is to install a roof balcony. All variants I found online start at the exterior wall. That is not possible here, as it ends one floor below. Cutting the balcony like a loggia would also cost too much space. Is it possible to build a balcony "overhanging," i.e., extending beyond the existing roof (but not beyond the exterior walls)?
The nicest would be a roof terrace in the corner between the "main roof" and the "side wing" of the staircase.
I have never seen anything like this anywhere and wonder about statics, roof beams, etc. and so on...

In Klein I saw a roof window that can be unfolded into a mini balcony. The glazed lower part could be pushed forward, and the upper window upwards. This created a balcony 1 meter wide and about 50 cm deep emerging from the roof. I wonder if there is also a large version of this?

What Wastl means can be found, for example, at Velux as a cabrio.

And as far as beams and statics are concerned, only a structural engineer and someone who knows about such things can tell you. This forum is only suitable for that to a limited extent.

Another problem not to be underestimated will be, for example, the drainage.