Hopefully Splunk will add this functionality soon. In the meantime I have created some documentation on how to do this process here: https://answers.splunk.com/answers/736869/servicenow-how-do-set-extra-custom-fields-when-cre.html
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If you want help I suggest you post your own question and show the code you’re using too. We can’t troubleshoot two issues on one thread as these may be very different custom code problems.
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