The author can show Jason's jealousy through his actions. For instance, when Percy is praised for a successful mission, Jason might clench his fists or look away with a scowl. He could also be short - tempered with Percy in group discussions, interrupting him or making snide remarks.
The show 'A Teacher' is purely fictional. The plot and characters were made up to entertain and engage the audience rather than being rooted in real events.