ShaderEffect shader variable scope

[eagl]

Basically I have a component that looks something like this:

//Shader.qml
ColumnLayout {
    property string fragPath

    (...)

    ShaderEffect {
        (...)
        id: shader
        fragmentShader: "shadereffects/" + fragPath + ".frag.qsb"
    }
}

Let's say the shader that I want to use is supposed to display a single color, so we can call it "color", and it uses a property also called color that the fragment shader uses.

//main.qml
Shader {
    property color color: Qt.rgba(0.5, 0.5, 0.5, 1.0)
    fragPath: "color"
}

The problem I'm having is that the fragmentShader doesn't have access to all variables in the ShaderEffect's scope. So I get an error ("ShaderEffect: 'color' does not have a matching property") that color doesn't exist. In this case I could of course make another property called color that references the property color in the ColumnLayout or make an alias. But if I want to make another Shader with a different fragmentShader, that uses other variables, that won't work anymore. I would prefer to not have to rewrite the whole Shader component for every different ShaderEffect.

Is there any way I can make qml define the properties in Shader in the ShaderEffect instead? Is there for example something like property alias content: shader.children but for properties?