Litchi is an autonomous flight app that is compatible with most DJI drones including the Mavic 2 series, Inspire 2, and Phantom 4 Pro. It is well known for being the first app to allow users to pre-plan waypoint missions from a desktop or Mac/PC laptop.

Recently, the developers behind the app announced an update for iOS and Android. All modes except for Waypoint, which is expected to be available in the near future, are available to Mavic Mini users. 
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https://www.dpreview.com/news/3188656347/litchi-app-s-latest-update-allows-you-to-track-subjects-with-your-mavic-mini