Aligning an image vertically at the top of a placeholder

[ccassan]

Hi all,
I am using v3.12.0. I have defined a pic placeholder with valign:"top" in my layout

placeholder: {
            options: {
                name: `${id}`,
                type: "pic",
                x,
                y: y + imageTitleSize,
                w,
                h: h - imageTitleSize,
                valign: "top"
            },
            text: `Image #${id}`
        }

and am adding an image in a slide with

slide.addImage({
        data: image.src,
        placeholder: placeholder,
        w: sourceW,
        h: sourceH,
        sizing: { type: "contain", w: ph.w as number, h: ph.h as number }
    });

The image is centered vertically in the generated PPT. How can I align the image at the top of the placeholder?
Thank you