Publish nan to a jointState topic

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Hi, I want to publish a jointState message from terminal with NaNs as the values inside some of its fields. Is there a way I can do that.

If I do

rostopic pub -r 2 /test sensor_msgs/JointState "header:
  seq: 0
  stamp: {secs: 0, nsecs: 0}
  frame_id: '/test'
name: ['l', 'r']
position: [0.0, 0.0]
velocity: [0.0, 0.0]
effort: [nan, nan]"

I get the following error

Unable to publish message. One of the fields has an incorrect type:
  <class 'struct.error'>: 'required argument is not a float' when writing '/test'

Thanks.