I want to create a filter that shows all the features that aren't deployed but have all his child stories/issues in final status (deployed or discarded).
Because of company policies, I can't install plugins or apps
Short answer: that is not possible with built-in capabilities of JQL.
The built-in Jira Query Language (JQL) does not have features to perform queries as you describe. That is, it cannot perform a JOIN to test parent / child work items. For frequent usage, this limitation is often solved with marketplace apps, however you describe being unable to install apps to extend the features of JQL.
Some possible workarounds include:
Kind regards,
Bill
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