You can use Enhancer Plugin for Jira's Metrics gadget for issues count.
You type JQL, and it calculates the issues count for the JQL and caches it.
More info and sample screenshots here
Sorry, I missed this answer.
Metrics feature is separated from Enhancer Plugin, and now SnapMetrics is available on Atlassian Marketplace which is a free app.
Best
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If you have Confluence you can just add a filter to a page using your JQL.
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Only the issues that match your JQL
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