How to Bring Category Name into PO Output for Communication

Dear Experts,

I have a requirement like to print the category name in the PO  Output For Communication.

the standard xml has only category_id, my question is how to bring category name to the xml

so it can be used in the rtf to print the category at the line level [Highlighted as below,].

<LINES_ROW>

   <LINE_NUM>3</LINE_NUM>

   <ITEM_DESCRIPTION>items needed are plugs for toen hall , tools for intsalation and wire for the wall, alarm for windows</ITEM_DESCRIPTION>

   <CANCEL_FLAG>N</CANCEL_FLAG>

   <UNIT_MEAS_LOOKUP_CODE>Each</UNIT_MEAS_LOOKUP_CODE>

   <ORDER_TYPE_LOOKUP_CODE>QUANTITY</ORDER_TYPE_LOOKUP_CODE>