Unfortunately, there is no such option in | set command, but you can achieve the same using an append-stats combination, like this
index=infra_service_perf sourcetype="XXX" itemKey ="XXXX" value >= 0.000 earliest=-1d@d latest=@m | stats count by name | table name | eval Action="Today" | append [ search index=infra_service_perf sourcetype="XXX" itemKey ="XXXX" value >= 0.000 earliest=-7d@d latest=-1d@d | stats count by name | table name | Action="Last7Days" ] | stats values(*) by name | where mvcount(Action)=1 | replace "Today" with "Added" "Last7Days" with "Deleted" in Action
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