I hope you found this already so for those following this is what I use:
index=itsi_summary [|`service_kpi_list` | search service_name="blah blah" kpi_name=* | fields kpiid | format ]
While this does what you asked for I provided the kpiid mapping here because this will return all kpi ids for the named service but it can also be used with a single kpi or subset to get specific kpi records.
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