'Jetpack Compose function with lambda () -> Unit

I'm trying to extract a method applied on a modifier into a Composable function

 TopAppBar(
            modifier = Modifier
                .align(Alignment.TopCenter)
                .height(56.dp)
                .background(
                    brush = Brush.verticalGradient(
                        colorGradient
                    )
                )

Specifically the Brush.verticalGradient() so that I can use the gradient Composable everywhere I need and just pass the list of colors to it.

I know that I need to use a lambda expression inside the Composable function but I'm not sure how to do it.

@Composable
private fun BottomBarGradient(
    content: @Composable () -> Unit) {
}

I'm pretty new in Compose. Can anyone point out a good tutorial/example for this?

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'Jetpack Compose function with lambda () -> Unit

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