Create a capex report based on your Atlassian JIRA issues
You can install the built extension from here: https://chrome.google.com/webstore/detail/jira-capex-report/nojcohbbfnojelnpelcookmhljdkfjaj
Just specify your login credentials and the JQL query for the JIRAs that you would like to analyse and of you go! Then all JIRAs are analysed, including sub-tasks, for logged hours during the time period that you've specified.