In saucepan on medium-high heat, cook berries, honey, and lemon juice until slightly thickened. Mash berries to release juices, then mix in chia seeds and let cool.
In bowl, mix mascarpone, vanilla bean paste, chamomile tea, and honey until smooth.
Bake tarts according to box directions, then let cool. Fill tart shells with berry mixture and top with chamomile mascarpone. Serve immediately, or store in fridge for up to 3 days.