RoundButton with GlowEffect

[ynatynat]

Does anybody know how to glow RoundButton according with contour?
I try to add glow effect to RoundButton like this:

    RoundButton {
        id:io
        text:qsTr("OUT1")
        checkable: true

        icon.height: Constants.fontL
        icon.width: Constants.fontL
        font.pixelSize: Constants.fontL


        width:200
        height:200

        layer.enabled: io.checked
        layer.effect: Glow {
            samples:10
            radius:8
            spread:0.5
            color: Material.accent
            transparentBorder: true

        }

    }

The glow effect spreads rectangle.
But I need the button glows according with button contour. Like this:

[johngod]

Dont know if it will work, but try to put that RoundButton inside a Rectangle with a radius equal to half is width and clip enabled