It is not my idea, but one that I though could work. Maybe for a Disney+ short film:
"The film would take us on the journey of becoming an Imperial Stormtrooper, from cadet to graduation. As close as we can get to a Disney version of Full Metal Jacket in space. For the most part, Stormtroopers are one of the best running jokes in Star Wars. Their infamous inaccuracy is the source of many jokes and memes on the internet. We think it’s about time for Stormtroopers to be respected for the highly trained soldiers that they are.
In Star Wars: The Force Awakens, Disney gave us a Stormtrooper we could care about, they humanized the role, gave us a face, that had a story, and a person struggling with inner turmoil. We think it would be a great idea to continue this trend, and watch a soldier go from cadet to trooper and to give more legitimacy to the army of the most powerful military force in the galaxy."
A character study of what it like to be stormtrooper. The realization and uncomfortable facts of being one, the inner conflict, the scorn of friends and family, and doing things you do not actually want to do or agree with.
Or something different to that and more along the lines of a modern updated version of Troops!