Are you looking for something like this? If not, please add a comment with more details about what you want.
index=_introspection host=* data.cpu_system_pct=* | timechart span=1d avg(data.cpu_system_pct) by host
another way that is faster, but has a different visualization
| tstats max(data.cpu_system_pct) as AvgCPUPct where index=_introspection by host