No. The HitCounts are cached in memory only and clear after a ISE service restart.
Please note that such counters are to give a relative measure how the policy rules are matched but not absolute.
ISE has an authentication summary report since ISE 2.3 but it's currently lacking statistics grouped by policy sets -- CSCvf95838. Instead, we may run and export a RADIUS authentications report and use other tools to gather matches on policy set, etc. A fairly popular option is to create a remote syslog target to forward authentication events to a tool like Splunk with Splunk Add-on for Cisco ISE
