The addition of the chia seeds is a nutritional bonus because the seeds add nutrients, fiber and protein to the berry jam. But the chia seeds are a key component of the jam in another way because they act as the thickening agent, eliminating the need for extra sugar.
In my mind, homemade berry jam is in another league than store-bought variations. And I love how fresh the freezer versions taste compared to the cooked and canned jellies. Each bite transports me to the berry patch as I taste the freshly-picked berries and remember all of the fun berry-picking excursions with my grandma and mom when I was little.