Tstats: How to Include new field?

[alex4]

I want to use the new search signature="test" in the below search.

I don't want to add this new signature to the existing lookup.

| tstats summariesonly=true values  (IDS_Attacks.action) as action 
    from datamodel=Intrusion_Detection.IDS_Attacks 
    by _time, IDS_Attacks.src, IDS_Attacks.dest, IDS_Attacks.signature 
| `drop_dm_object_name(IDS_Attacks)`
| lookup rq_subnet_zones Network as dest OUTPUTNEW Name, Location
| lookup rq_subnet_zones Network as src OUTPUTNEW Name, Location
| search NOT Name IN ("*Guest*","*Mobile*","*byod*","*visitors*","*phone*")
| lookup rq_emergency_signature_iocs_v01 ioc as signature OUTPUTNEW last_seen 
| where isnotnull(last_seen) 
| dedup src 
| head 51