Use this command for adding an image to a sheet.
jx:image(src="image" lastCell="A2")
src: expression that returns a byte[] array that contains the image data
imageType: can have these values: PNG (default), JPEG (not JPG), EMF, WMF, PICT, DIB.
scaleX and scaleY: optional Double values for scaling
lastCell: area end
Here is example code for adding an image to the data map:
InputStream imageInputStream = ImageDemo.class.getResourceAsStream("business.png");
byte[] imageBytes = ImageCommand.toByteArray(imageInputStream);
data.put("image", imageBytes);
jx:image is part of jxls-poi and is only available if you use JxlsPoiTemplateFillerBuilder or add the ImageCommand using withCommand().