GlobalPositionAwareModifierNode

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.size
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.layout.positionInRoot
import androidx.compose.ui.layout.positionInWindow
import androidx.compose.ui.unit.dp

Column(
    Modifier.onGloballyPositioned { coordinates ->
        // This will be the size of the Column.
        coordinates.size
        // The position of the Column relative to the application window.
        coordinates.positionInWindow()
        // The position of the Column relative to the Compose root.
        coordinates.positionInRoot()
        // These will be the alignment lines provided to the layout (empty here for Column).
        coordinates.providedAlignmentLines
        // This will be a LayoutCoordinates instance corresponding to the parent of Column.
        coordinates.parentLayoutCoordinates
    }
) {
    Box(Modifier.size(20.dp).background(Color.Green))
    Box(Modifier.size(20.dp).background(Color.Blue))
}

import androidx.compose.ui.Modifier
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.layout.positionInRoot
import androidx.compose.ui.layout.positionInWindow
import androidx.compose.ui.node.GlobalPositionAwareModifierNode
import androidx.compose.ui.node.ModifierNodeElement
import androidx.compose.ui.platform.InspectorInfo

class PositionLoggerNode(var id: String) : GlobalPositionAwareModifierNode, Modifier.Node() {
    override fun onGloballyPositioned(coordinates: LayoutCoordinates) {
        // This will be the size of the Layout.
        coordinates.size
        // The position of the Layout relative to the application window.
        coordinates.positionInWindow()
        // The position of the Layout relative to the Compose root.
        coordinates.positionInRoot()
        // These will be the alignment lines provided to the Layout
        coordinates.providedAlignmentLines
        // This will be a LayoutCoordinates instance corresponding to the parent of the Layout.
        coordinates.parentLayoutCoordinates
    }
}

data class PositionLoggerElement(val id: String) : ModifierNodeElement<PositionLoggerNode>() {
    override fun create() = PositionLoggerNode(id)

    override fun update(node: PositionLoggerNode) {
        node.id = id
    }

    override fun InspectorInfo.inspectableProperties() {
        name = "logPosition"
        properties["id"] = id
    }
}

fun Modifier.logPosition(id: String) = this then PositionLoggerElement(id)