Enabling lightbox on a gallery card image

Site URL: https://joburgpeople.com/people/2022/3/25/marandela-matilda-kutama-26ywr

Hi, 

Anyone able to help me with some code that could enable the image in my gallery block to show up in a light box? I want this to work in all of my blog posts so that they have the same functionality. 

The password is JP1

thanks in advance. 

Thom