I'm not completely sure I follow the question, so my answer is three-fold, and will hopefully hit the mark:

• to print a chart 'as is' in libreoffice, simply select it by clicking on it, and go 'file > print' but choose "selected cells" in the 'range and copies' section.




• it appears that you can't 'export' the chart directly as an image from calc, but you can paste it into libreoffice draw, and then save it as an image.




• or you can just fall back on taking a screen shot, and printing it from gimp, or shotwell, etc.