You will learn how to link your JIRA tasks directly on SourceTree
Open your repository browser on SourceTree and click Settings located top-right.
Open Advanced tab and on Commit Text Replacements block click Add
On Replacement Type dropdown select JIRA Project Link option.
On Project Prefix field type your project prefix (ex. MEBLO)
On Hosting URL field type root URL of your JIRA (ex. https://rocketbrasil.jira.com)
All commit comments with [PREFIX-NUMBER] will have a link on SourceTree directly to the associated JIRA task.
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Works like a charm. I was thinking integration like resolving JIRA issues with a commit from SourceTree as an option. In the meantime, this will do.