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I do not know a ROS2 equivalent of the command you described . However a simple workaround to get a similar behavior could be to use grep for this purpose. You can specify the number of lines that should be visible after your search key with the -A [num lines after match] option. Just set it to the size of the data field of interest.

For example to view the linear acceleration of an sensor_msgs/msg/Imu one could write:

ros2 topic echo /imu_topic | grep -A 3 "linear"
 linear:
   x: 0.0
   y: 0.0
   z: 0.0
(...)