In a small sauce pan over medium-high heat, cook cherries, smashing with a wooden spoon (or a potato masher) until cherries are mashed and the mixture is bubbling.
Stir in the chia seeds, granulated sugar and lemon juice until well combined. Cook for 1 minute, then remove from heat and stir in almond extract, if desired.
Let jam cool for 10 minutes and then stir one more time. As the jam cools, it will continue to thicken.
Serve jam immediately, or transfer to a sealed container and refrigerate for up to 1 week, or freeze for up to 3 months.