How to pass a JointTrajectory ?

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Hello! I want to pass a joint Trajectory form my Motion Planning Response to FollowJointTrajectoryGoal. How can I make it. They both have the member trajectory_msgs/JointTrajectory, how can I pass the JointTrajectory.

I just found the DisplayTrajectory has a method to pass the parameter, but FollowJointTrajectoryGoal didn't.

  moveit_msgs::DisplayTrajectory display_trajectory;

  display_trajectory.trajectory.push_back(response.trajectory);