Maybe Tools -> GEGL Operation -> Color warp.
Lock the alpha channel to keep the transparency.
Color pick the From color in the image.
Select the To color
Enter a really large number in the weight.
As an animation https://i.imgur.com/8e1iZ9X.mp4
Lock the alpha channel to keep the transparency.
Color pick the From color in the image.
Select the To color
Enter a really large number in the weight.
As an animation https://i.imgur.com/8e1iZ9X.mp4