Yes there is, it’s actually a script I made to convert Mission Planner waypoint missions to Litchi CSV.
Read about it more on mavicpilots: Mission Planner Surveys to Litchi | DJI Mavic, Air & Mini Drone Community
Check my post on this forum: Mapping/survey grid tool - #19 by Yaroslav
Check out its GitHub page with instructions, download, and tutorial: GitHub - YarostheLaunchpadder/MissionPlanner-to-Litchi: Convert Mission Planner (ArduCopter) Waypoint Missions to Litchi CSV Format to execute on DJI Drones