Place mixed berries, lemon juice + coconut sugar in a saucepan over moderate heat and bring to a light simmer, stirring often with a wooden spoon.
Add vanilla and Maqui and stir to combine.
Simmer for 5 minutes, remove from heat + allow to cool a little.
Scoop mixture into a high speed blender + blend on low until broken down into a rough purée (you can use a stick blender for this if you choose or skip this step entirely for a chunkier jam).
When blended, pour mixture into a small bowl and stir chia seeds through. Allow to cool before refrigerating (can be stored up to a week in the fridge).
