ShaderEffect Dependencies

[psysu]

Hello, i'm currently integrating a post-processing antialiasing technique to my Qt Application.

The technique requires multiple-pass rendering. where each pass requires a texture of the previous pass.
Below qml code is the structure of the rendering process.

Item {

    Image {
        id: img
        ...
    }

    layer.enabled: true
    layer.effect: fx

    Component {

        id: fx

        ShaderEffect {
            id: D
                
            source1: A
            source2: C
            
            ShaderEffect {
                id: C
                source: B
            }
            
            ShaderEffect {
                id: B
                source: A
            }

            ShaderEffect {
               id: A
               ...
            }
        }
    }

}

But when i do this the application is showing just black screen, i used renderdoc to debug the GPU pipeline state.
From there what i found out was, only ShaderEffect D is bound but other ShaderEffect did not get executed.
I think i'm doing a mistake with QML bindings, please help if you know what i'm doing wrong here.

Thanks