Header and timestamp for Float32MultiArray in ROS2 [closed]

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Hi, I am working with ROS 2 foxy distribution. I have a publisher which sends an array (for every second) to the ROS queue. I am able to successfully subscribe it and save it. I want to add a timestamp every time the array is getting sent over ROS queue. I tried the following code.
Without timeStamp: // Working

data_to_send = Float32MultiArray()

data_to_send.data = my_array

sample_publisher_.publish(data_to_send)

With added timestamp code: // Not Working

pp = PublishingNode() // creating an instance of the class

data_to_send = std_msgs.msg.Header()

data_to_send.stamp = pp.get_clock().now().to_msg()

data_to_send.data = my_array

AttributeError: 'Header' object has no attribute 'data'

The aim is send an array along with the timestamp every second using python in ROS2.

Any guidance would be helpful?

Regards Niranjan