How I can animate transparency a color-rect in Godot?

in Art & Design
I have my reasons, why I don't make a transparent png image and add it into Godot. I want to animate the transparency.
Comments
You can animate the transparency of the
self_modulate
ormodulate
properties using a AnimationPlayer or Tween to animate the transparency of a Control-based node. I've done this countless times for various UI fades.