Ability to see image render export dashed outline in viewport

When you select a square ratio in the export render image settings you will see a dashed outline of what will be rendered. Except the export window covers a big portion of the viewport/image. So I cant see what is in the frame.

When you close the export window to view the image the dashed line dissapears.

Can you add an option to keep dashed render size/ratio outline visible in viewport?