If a script can do REST operations to a certain URL, it can certainly interact with JIRA through it's API, whatever that script is. You will just have to learn how that particular script implements it and use it against the JIRA API Endpoint for "Component" https://docs.atlassian.com/jira/REST/latest/#api/2/component
It was old clunky technology that Atlassian didn't want to use or support any more. Most of the use-cases for Jelly were met by the new REST API, improving import functions and the automation plugin.
Jelly was also the only way that an admin could get into the heart of JIRA and break things without add-ons, so I suspect they wanted to close that option off as well.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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