class UnconstrainedSizeModifier : LayoutModifier {
    override fun MeasureScope.measure(measurable: Measurable, constraints: Constraints, layoutDirection: LayoutDirection): MeasureResult {
        val placeable = measurable.measure(constraints.copy(maxWidth = Constraints.Infinity, maxHeight = Constraints.Infinity), layoutDirection)
        return layout(placeable.width, placeable.height) {
            placeable.place(0, 0)
        }
    }
}

fun Modifier.unconstrainedSize() = this + UnconstrainedSizeModifier()

WithConstraints(modifier = Modifier.fillMaxSize()) {
        var sizeRequiredToDraw by state { IntSize(0, 0) }
        val canvasWidth = maxWidth.toPx()
        val canvasHeight = maxHeight.toPx()
        val scale = remember(sizeRequiredToDraw, maxWidth, maxHeight) {
            val widthRatio = canvasWidth / sizeRequiredToDraw.width
            val heightRatio = canvasHeight / sizeRequiredToDraw.height
            min(widthRatio, heightRatio)
        }

        Text(
            modifier = Modifier.wrapContentSize().unconstrainedSize().drawLayer(scaleX = scale, scaleY = scale),
            fontSize = 50.sp, // max size
            text = "This is your text",
            onTextLayout = {
                sizeRequiredToDraw = it.size
            }
        )
    }