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Not a complete answer as I'm going from memory, but your JointTrajectory message needs to provide a list of all joint_names, e.g. gripper_finger_joint_l and gripper_finger_joint_r as strings,

points is a list of TrajectoryPoints. where each point provides the data for a single knot point at a given time from start.

For a trajectory, you'd need at least two points

Each knot point needs to provide the commanded positions, (and vel and acc for higher order splines). So for two joints, positions should be an array of two values. If you don't provide all required data for joint names and positions, then the command won't work.