SAP PI Mapping Question

Hi,
Requirement: Need to map the below scenario
Source Target

HEADER_TEXT 1.unbounded (Array)

TEXT1 1.1 String ID 1.1 String
TEXT2 1.1 String TEXT 1.1 String

TEXT1 should map as 1st row in HEADER_TEXT ID is a constant of K01
TEXT2 should map as 2nd row in HEADER_TEXT ID is a constant of K02

How to map in PI ESB graphical tool in message mapping.