You can use separation pages for this. Windows comes with a number of pre-defined separation pages but you need to enable separation pages from Printer Properties > Advanced tab > Separation Pages. Select the file you want (e.g. PCL.SEP) from C:\Windows\System32
You can modify the selected file. The Username (@N) is normally included in the default file, but you can add or put it somewhere else. You can also include the contents of a specified text file (@Fpathname). That file can contain the text you want. Alternatively, depending on which is easier for you, you can just add the text to the sep file (@T). If you really need a counter, then you may need to use some script to create the text file with the data.
The required syntax is available from Microsoft Support.