In this example a custom field will be configured for counting the number of Bugs linked to the issue. When clicking of the number the issues should be shown through a hyperlink in the issue navigator.
For this a Calculated Text Field is needed. The configuration will look like this:
Text to be parsed is: "<a href='"+%{00169}+"/issues/?jql=issue%20in%20linkedIssues(\""+%{00015}+"\")%20and%20type%3DBug'>" + count(filterByIssueType(linkedIssues(),"Bug")) + "</a>"
Note that:
Once configured and added to the issue, the issue screen will look like this:
Clicking on the number resulting from the custom field (in this case "2"), will link to the issue navigator: