Hi Ragavi,
As Bart already mentioned that the default AnimateLabel widget is only focused for Input widget but you can do some modification within the same widget implemenation to fulfill your use-case.
For the mentioned use-case, I have cloned the AnimateLabel widget from OutSystemsUI module and modified i.e. customized the defined JavaScript code for AnimateLabel widget to support the TextArea Input widget.
See this sample screen TextAreaAnimateLabelDemo
Refer to the attached .oml file
Hope this helps you!
Kind regards,
Benjith Sam