Customer-facing "Enlarge" option for images in Slider Engagement Dialogs

We publish a monthly Product Updates Slider Engagement to our customers, and we had a customer request the ability to enlarge the screenshot images in each slide, as they can be quite small images trying to show a sizeable section of an in-app screen. I've attached an example. We advised the customer to right click to open the image in a new tab, and we're aware that we can add a hyperlink to these images to show the screenshot in a separate window if desired.

However, I think it would be nice if a customer viewing our Engagements had the option to hover and/or click and choose to show a larger version of the image, without leaving the Engagement and our app, perhaps in a pop-in modal on top of the engagement. This could be a setting to toggle on or off in the Engagements Editor, or just a standard feature of images in Engagements.

This would be a nice value-add for our Product Updates Slider Engagements, where the images tend to be screenshots, and can be hard to see in the small Engagement dialog. (Note: we wouldn't want to make our Engagements dialogs much bigger, to accommodate larger images, as users on smaller screens would have a much worse experience. Screen-size-responsive dialog sizing would be a great feature add, too!)

I did also reach out to Gainsight Support about this, and they suggested I post it here. They also let me know that we would already be able to do this with a Guide-type Engagement, by adding onclick JavaScript directly in the engagement HTML. Unfortunately we prefer Sliders over Guides for this type of update, as the Guide’s true “buttons” make it feel more like “work” for our users to get through, where a slider is more lightweight-looking and easier/more intuitive to click through using the arrows. I should note that if we had this same HTML editability for Sliders, that would also work for what we need to accomplish, but a toggle or setting might be more user-friendly.