Generating image in elixir with text

Question

I would like the same what this post is asking for: Generating initials avatar with Elixir The answer to use Mogrify is not very helpfull. I already got https://github.com/zamith/mogrify_draw/ but it is not generating the text I want. The examplecode

%Mogrify.Image{path: "test.png", ext: "png"}
  |> custom("size", "280x280")
  |> canvas("white")
  |> custom("fill", "blue")
  |> Mogrify.Draw.circle(140,140,100,100)
  |> custom("fill", "yellow")
  |> Mogrify.Draw.circle(140,140,140,100)
  |> create(path: ".")

is creating the image with the circles.

I tried

%Mogrify.Image{path: "test.png", ext: "png"}
 |> custom("size", "280x280")
 |> canvas("white")
 |> Mogrify.Draw.text(10, 10, "Text")
 |> create(path: ".")

but this is only creating a blank white picture. Any ideas what I am doing wrong?

Thank you.