Support rotating popup label text in CMPCharts

[nick0226]

Hi!

I'm currently using the CMPCharts library and exploring how the popup label (tooltip) is implemented.

Right now the popUpLabel parameter only returns a String:

popUpLabel = { x, y ->
"Date: $date\nAmount: $value"
}

Because of this it seems impossible to apply Compose modifiers such as rotation. In my case I need the popup label text to be rotated (for example 90°) to better fit the layout when using horizontal charts.

From what I understand, the popup label is internally rendered as text and not as a Composable, so customization options are limited.

My questions:

1. Is there currently a way to rotate the popup label text?
2. Is it possible to provide a custom Composable instead of a String for popUpLabel?
3. If not, would you consider supporting something like:

popUpLabel = { x, y ->
CustomComposableLabel(...)
}

This would allow more flexible UI customization (rotation, styling, layout, etc.).

Thanks for the great library!