Here is the solution which worked for me using <util:XmlFile

 <Component Id="cmp5F6F9B35A372943520CC8D5ABDE2F507"
Directory="dirCFCE6D07D3330FE628276777F0488B18"
Guid="{3AFB6DE8-D43E-4EC3-BC10-251EABFE3DD0}">

                <File Id="fil24F01DF9AB46C9205A3E021D5E98A3CF" KeyPath="yes"
Source="$(var.SCBUDirect.B2CWeb.ProjectDir)Web.Prod.Web1.config"  >

                <CopyFile Id="KCopy_ConnPROD" 
DestinationProperty="DestFilesWebsiteFolder"
DestinationName="Web.config" />

                </File>
              <Condition> </Condition>

              <util:XmlFile Id='name' Action="setValue"
                                     Sequence="1"
                                    
File="[#fil793B13C959C0F19A591946A8F8A1CF6E]"                                   
         
ElementPath="//configuration/system.webServer/httpProtocol/customHeaders/add[\[]@name='X-
 
ServerID'[\]]"
                                     Name="value" SelectionLanguage="XPath"
                                     Value='[ComputerName]'/>
             
</Component>



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