Fortunately, my awesome husband found me the amazing recipe below, and I've made at least one big batch of ground cherry jam every summer since!
This is my go-to recipe and I've never used any others - I love it as it's super simple, tastes amazing, and is also low-sugar. I would describe this jam as tasting like "if caramel was a fruit and you made jam out of it". However, for even more rich caramel-y flavor, try using demerara or turbinado sugar. YUM!