Support declaring value of a Component type property inline

QtQuick3D has many items with delegate properties that take Component type. A common way to declare these delegates is having the component declared inline like this:

                ParticleModelShape3D {
                    id: modelShape
                    delegate: Model {
                        id: sphere
                        source: "#Sphere"
                        DefaultMaterial {
                            id: sphereMaterial
                            diffuseColor: "#4aee45"
                        }
                        materials: sphereMaterial
                    }
                }

While this works fine otherwise, the sphere model and material do not show up in navigator, so you have to select them in Text Editor if you want to adjust their properties.

It should be possible to access these inlined components from the navigator.

It should also be possible to create these inlined components without having to resort to Text Editor. E.g. When dragging a suitable component from library to the node having the delegate property, it could ask if you want to add it to delegate property.

UX should specify exactly how these things should work.