Need Help with Dynamic Field Creation After Lookup in Cribl Stream Hi Team,I’m working on an SNMP trap pipeline where:Input event has fields like trap_name and trap_varbind_apSysMgmtTaskSuspend.I have a Lookup table that maps:trap_name → varbindname → Output_attribute_value.After Lookup, I want to create a new field dynamically:Field name = value of Output_attribute_value (e.g., id)Field value = value from the field referenced by varbindname (e.g., trap_varbind_apSysMgmtTaskSuspend).I tried using Eval with:JavaScript[Output_attribute_value] = get(__payload, varbindname)Show more lines…but got Unallowed assignment operator error.Then I tried a Code function: JavaScriptconst targetField = event.Output_attribute_value;const sourceField = event.varbindname; if (targetField && sourceField && event[sourceField]) {event[targetField] = event[sourceField];}Show more linesBut the new field (id) still doesn’t appear in the final JSON.Questions:Is Code function the right approach for dynamic field names?How can I verify Lookup values before Code