Add Image Captions to All Product Images

Is there a way for Enhold to display image captions to all product images?

I’ve tried the css from: https://kriesi.at/support/topic/how-do-you-put-a-caption-below-an-image/ with no success–but I didn’t see captions anywhere, so I was thinking there may be something else awry here.

.av-image-caption-overlay {
  background: none repeat scroll 0 0 rgba(0, 0, 0, 0) !important;
  bottom: -20px !important;
  color: black !important;
  height: auto !important;
  left: 50% !important;
  transform: translate(-50%) !important;
  width: auto !important;
}

Thanks!