How to Lazy Load only Selected Images on Selected Pages?

Hi guys, yes of course I’ve looked at the regular lazy load WP plugins, they don’t allow this level of specificity in their settings though, so I’m guessing I need to include lazy load script manually and then configure the code myself. But how? Where do I start? And what’s the best option for that?

About “EWWW Image Optimizer” My images are already optimized using JPEG mini, so that"s already taken care of.