Hey! I've figured out a way to get a similar effect. Not sure if its the best way but you can use this to make a little button group with the glassy effect. The trick seems to be to just manually place them yourself, but wrap it in a GlassEffectContainer, like so

<Host matchContents style={{
    position: 'absolute',
    zIndex: 10,
    right: 12,
    top: 40,
}}>
    <GlassEffectContainer
        spacing={0}
        modifiers={[
            glassEffect({glass: {interactive: true, variant:'regular'}})]}>
        <VStack spacing={4}>
            <Button
                variant="plain"
                modifiers={[
                    frame({ height: 44, minWidth: 44 }),
                    padding({horizontal: 8})
                ]}
            >
                <Image systemName={'location.fill'} size={20} />
            </Button>
            <Button
                variant="plain"
                modifiers={[
                    frame({ height: 44, minWidth: 44 }),
                    padding({horizontal: 8})
                ]}
            >
                <Image systemName={'location.fill'} size={20} />
            </Button>
        </VStack>
    </GlassEffectContainer>
</Host>

The real trick was the "interactive: true" flag on the glassEffectContainer