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I ran into the same problem with that plugin - but I've tried everyone that WP currently has to offer and didn't see that option on any of them. My guess would be that they're not currently using it because AMP is only showing in the carousel right now, which doesn't pull in meta descriptions. I suspect they'll be updating it accordingly as Google continues to put more emphasis on AMP. *edit - As of Tuesday, Google is including AMP in the core search results, so hopefully plugin update is coming soon

Hi Andy, Essentially the site has been inherited and we need to break it down nice and clearly so that the new developers have a clear plan to work from. We just want to ensure that we're not missing anything really. Thanks, Sam