Have you read the book “Empire of the Sun” by J.G. Ballard, which is about an English boy in a Japanese p.o.w. camp in China?
There was also a very good series made by the BBC about European women in a p.o.w. camp, called “Tenko”.
Saw the movie. It was very similar to my dad’s and uncle’s and grandmother and grandfather’s experience, all the way down to the malnutrition. My dad told me that when the Japanese came on shore, his dad took them down to the shore to watch and said they would never see anything like that again. They had to wear patches too, my uncle still has theirs.