Currently, by default JCMA does not migrate Jira filters except for the filters that are used in any migrated agile board. More details available here.
There used to be a page documenting a dark feature which allows for the migration of all Jira Filters. The page was available here – How to migrate all boards and filters with the Jira Cloud Migration Assistant (JCMA). For some reason, since a few days ago, the page is not accessible anymore (for now we can still see it in Google cache, see here).
Was this page removed/hidden on purpose or by accident? We tested the feature and we were very happy with the results. Can we continue to recommend to our users to use this dark JCMA feature for the migration of all Jira filters?