i want to make custome arrow while iam using ballon to be shown as the design

popup example

I want to make such a design where the arrow is more circular. How can I do that?

This is the code that I wrote and I want to modify it to make it pop-up shape like Design

`val builder = rememberBalloonBuilder {
setArrowSize(20)
setMaxWidth(300)
setArrowPosition(0.5f)
setArrowPositionRules(ArrowPositionRules.ALIGN_ANCHOR)
setWidth(BalloonSizeSpec.WRAP)
setHeight(BalloonSizeSpec.WRAP)
setPadding(12)
setMarginHorizontal(12)
setCornerRadius(8f)
setBackgroundColor(Color.Black)
setBalloonAnimation(BalloonAnimation.ELASTIC)
}
var balloonWindow: BalloonWindow? by remember { mutableStateOf(null) }

        Balloon(
            modifier = Modifier.align(Alignment.Start),
            builder = builder,
            onBalloonWindowInitialized = { balloonWindow = it },
            balloonContent = {
                Text(
                    text = "Test Test Test TestnTest! Test Test Test Test",
                    color = GrayColor,
                    style = MaterialTheme.typography.labelLarge
                )
            }
        ) {
            Text(
                modifier = Modifier.clickable { balloonWindow?.showAlignBottom() },
                text = "Show More",
                color = PrimaryColor,
                style = MaterialTheme.typography.labelMedium
            )
        }`