How to change the pivot point of canvas layers follow_viewport_scale?

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Godot Version

4.2

Question

Hello!
The pivot point used by Godot when changing the follow_viewport_scale attribute of a CanvasLayer is the middle of the screen, as shown in this simple example:

image

The script for CanvasLayer is the following:

extends CanvasLayer

func _unhandled_input(event: InputEvent) -> void:
	if event.is_action_pressed("ui_accept"):
		var tween: Tween = get_tree().create_tween()
		tween.tween_property(self, "follow_viewport_scale", follow_viewport_scale * 0.1, 1)

I placed a small red rectangle named Pivot in the middle of the screen to see the CanvasLayer shrink towards the middle:

vid1

I want to change change this pivot point to an arbitrary point on the window. For instance, using a pivot point in the middle of the Icon sprite, it would produce something like this:

vid2

I scaled down the sprite scale attribute directly for the previous example, but that is not an option for me.

I tried various things, for instance changing get_viewport().global_canvas_transform.origin while setting the CanvasLayer offset property to the opposite value (one technique I found commonly used to change pivot point), but could not make it work.

Any help appreciated!