No formatting, üst carriage return for next paragraph.
But you said ” Shortfall is it shows the HTML coding for paragraphs.“. You don’t need HTML formatting for a carriage return.
However, a gallery of images is not the place for long complex explanations, just for looking at images. So even if you do include a simple carriage return (literally), the gallery display will always combine each line into a continuous paragraph. Otherwise the text will quickly cover the image, which is not the intent of the feature.