Zoom to images OR a custom lightbox with zoom?

Hello! This seems to be an unanswered topic on here (or the answers are from a couple of years ago).

I am setting up a new Squarespace site using the Jasper template. I have images I need to upload that are annotated and I need to allow for the user to either:

1) zoom in to the image (like this... but I wasn't able to get this to work: https://www.magictoolbox.com/squarespace/)

OR

2) add zoom in/out functionality to a lightbox. Is this possible?

Let me know.... and if I can get this to work on another template please let me know. Many thanks!