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SwiftUI Material on top of Canvas view

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I'm having a hard time applying .ultraThickMaterial on top of a Canvas view. With this code, no material is applied:

// struct Aurora: View
    Canvas { graphicsContext, size in

            roundedRect: .init(x: .zero, y: .zero, width: size.width, height: size.height),
            cornerRadius: 20,
            style: .continuous
          with: isSelected ? .color(.green) : .color(.tertiary)

        graphicsContext.fill(.circle(center: .init(x: size.width / 2, y: size.height / 2), width: size.width / 8), with: .color(isSelected ? .white : .clear))

        // other logic

I'd like to apply .ultraThickMaterial on top of this to create a sort of aurora effect. I thought about creating the material directly inside the Canvas view, but using the graphicsContext the only thing I'm able to create is a gaussian blur using .addFilter(.blur(radius:)).

Any pointers would be appreciated!


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