I have created this structure and give Field reference value as "myText" like below picture.

On accessing the root xml of structure, name attribute value of dynamic-element is a default text value. Like shown below.

<root available-locales="en_US" default-locale="en_US" version="1.0"> 
   <dynamic-element index-type="keyword" instance-id="54vS2SGv" name="Text13156709" type="text"> 
       <dynamic-content language-id="en_US">textValue</dynamic-content> 
   </dynamic-element> 
</root>

How can i change name attribute to field reference text that i made while creating this structure?

I'm using Liferay CE 7.4 version.