Duplicated custom fields after project migration ((xxxxxx created by JIM during import process))

[Imdad KP]

Hi Team,

I can find many fields are duplicated or doubled after few migration process and the description (xxxxxx created by JIM during import process). How can I find which are all those used or unused for projects.?

While I was searching I can find "Custom Fields Usage for Jira"  plugin which is showing used/unused custom fields. Can I delete those?. Will it be part of any other screen or projects?

Thanks,

Imdad KP