Use case
Return the total number of issues with any of the fix versions selected in the current issue.
Expression
Create and configure a Smart field using this expression in General parsing mode:
%{%{issue.fixVersions} != null ? count(issuesFromJQL("fixVersion in ('" + jiraExpression( "issue?.fixVersions?.map(v => v?.name).join(\"','\") ") + "') ")) : null}
