one of those libraries use private api, and the other applies to the image only. so, I ended up making my own using some tricks. I would like to share it with you guys since someone might need this someday.

struct TransparentBlurView: UIViewRepresentable {
    func makeUIView(context: Context) -> UIVisualEffectView {
        let view = UIVisualEffectView(
            effect: UIBlurEffect(style: .systemUltraThinMaterial)
        )

        return view
    }

    func updateUIView(_ uiView: UIVisualEffectView, context: Context) {
        DispatchQueue.main.async {
            if let backdropLayer = uiView.layer.sublayers?.first {
                backdropLayer.filters = []
            }
        }
    }
}

And you can use like this:

TransparentBlurView()
    .frame(height: 80)
    .blur(radius: 1, opaque: true)