Unfortunately due date only accept a concrete date while manually editing the field. However, if you need to set the due date in the same way for all issues within an issue type ( I mean, all bug need to due on 2 weeks) you can do it programatically by using a custom postfuction, event listener or automatio rule provide by a third-party app (e.g: Script Runner, Automation for Jira, Jira Workflow Toolbox, ...)
Hope this helps,
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