Hi
Well the answer to your question is "Yes". However the expression cannot create fields in data monitoring, they have to exist before. Therefore the solution is to create a field "COMMENT" and to use it in your rule. When calling the task you will map it with an empty dummy field.
Although, it is probably redundant to have this field as your rule will only trigger records that match your condition ... therefore all return rows will contain an ADDRESSE IN ADDRESS LINE1 ... You can use the different attributes of the rule for storing this comment and reuse it in the output of Data Monitoring.
Hope that helps
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