Flag options for slides to keep track of workflow needs

A feature that would be really helpful for my workflow would be to be able to flag individual slides for follow up work. I’m thinking of something similar to how you can flag photos and folders in Lightroom Classic.

So, as I’m working on a photo slideshow sometimes particular slides need more attention to get the animation just right. I’d like to be able top “flag” that photo so I can move on. Maybe a simple right-click and choosing a colored flag so I can pick it out visually. Later, when I have more time, I can see which slides have flags and I can focus my attention right where I need to, rather then searching and trying to rememberer what needed extra work.

Thanks for considering this!