Lightbox customization with figcaption

Hello,

I am trying to display the figcaption or description of the image somewhere on the lightbox (bottom, top or side).
I tried to check the default css of wappler and see if I can use the classes on the default css style in my custom css. As you can see on this image It is not working for me. I tried to modified by html document also, I am still with the same result.

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I am sure wappler had (figure and figcaption) in the default css for reason. I hope someone can help me display on the lightbox the description or figcaption when users click on the link or image. Or if you have any recommendation. It will be welcome.

Thank you