Yes, Component Leads are a possibility.
Why I asked about the instance is because on JIRA Server you can install an add-on called ScriptRunner which will allow you to create a Script Function-type Post Function which can do basically anything you want, e.g only set a default Assignee if the field is empty.
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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