Rinse and hull the strawberries. Chop the strawberries into smaller pieces. For smaller strawberries, slice them in half. For larger strawberries, slice them into quarters or eighths. Rinse the rhubarb and slice them to 1/2-inch slices.
Place the chopped strawberries, rhubarb, ginger, orange juice, and maple syrup in a medium saucepan. Cook over medium heat, until it reaches a boil. Reduce the heat to a medium low and let the fruit simmer until it breaks down, another 10 to 15 minutes. I cooked it for 15 minutes. Stir the jam occasionally to keep it from burning at the bottom. If there are still large chunks of fruit after 15 minutes, use the back of a wooden spoon or a fork to break down the fruit.
Reduce the heat to low. Stir in the chia seeds and let everything simmer for another 5 minutes. Turn off the heat and let the jam sit for 10 minutes. The chia seeds will expand as the jam cools, which thickens the jam. When you scoop some of the chia seed jam with a spoon, it should slide down the spoon very slowly. If your jam is still thin, add another half tablespoon of chia seeds and let the jam sit for another 10 minutes.
Refrigerate the jam in a jar for up to 3 to 4 weeks.