Are the Extra Featured Images Visible on the Pagte?

I’d like to add the multiple different featured images that Google prefers for AMP pages so they have flexibility on what they display in search results. My structured data plugin picks up the featured image of the post automatically, which is how Google knows they exist. So this plugin appears to be my solution.

But…I just want to be certain. Just because I add an extra featured image, that doesn’t mean it will show up on the public version of the page? It just exists in the background, so to speak? (Which is what I need.)