By skyforbes 
Just add this text below your image generation prompt:
On the outermost part of the frame, generate a white border with a height equal to 1/8 of the total height and a width equal to 1/8 of the total width, proportionally.
The generated image will include a white border that covers the watermark — then simply crop it out!
The downside is you won't get a full-pixel image without cropping, but it works well enough!