Grammar of "data:\ true" and "{data: True}"

Course Support ROS2 Basics in 5 Days (Python)
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Hello, I’m on Unit 4 Service calls for ROS2 Basics in 5 Days…

And I’m executing the command
ros2 service call /moving_right std_srvs/srv/SetBool data:\ true

I’m just curious because normally we use:
ros2 service call /moving_right std_srvs/srv/SetBool "{data: True}”

How is "data:\ true" equivalent to the yaml format?

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