Heat the strawberries, pure maple syrup, and lemon juice in a saucepan over medium-high heat, covered. Allow the mixture to come to a full boil then reduce the heat to a controlled boil and continue cooking until strawberries have softened, about 10 to 15 minutes. Mash the strawberries using a fork or a potato masher, until your desired consistency is reached (I like to leave mine fairly chunky).
Add the ground cinnamon, sea salt, and chia seeds and stir well. Continue cooking, uncovered, until the mixture thickens, about 8 minutes. Remove from the heat and allow the jam to cool for 10 minutes. Add the pure vanilla extract and stir well.
Transfer the jam to a bowl and refrigerate until chilled (note: you can also put the bowl in the freezer for about 40 minutes and stir periodically to speed up the process). Once cool, transfer the jam to a sanitized jar and seal it well. Jam keeps in the refrigerator for up to 1 week.