MyScreen.kt

// [...] Composable screen code 
when (state) {
    MainState.Loading -> {
        ShimmerProvider {
            ItemCard(item = fakeData)
        }
    }

    is MainState.Success -> {
        ItemCard(item = state.itemData)
    }
}

@Composable
private fun ItemCard(
    item: ItemData,
    modifier: Modifier = Modifier
) {
  Text(
    text = item.description,
    style = MaterialTheme.typography.bodyMedium,
    modifier = Modifier.shimmerable()
  )
  // [...] Remaining Composable code
}