No. The JIra assignee is a single user, the person who is definitively the current person responsible for an issue. That's it.
If you need multiple users on an issue, then add (multi) user-picker custom fields, but bear in mind that they won't have the same functionality as the assignee field.
...It's true that there are projects in Jira; but they are merely a way to cut off issues, to tell them apart from other sections of work and to apply rules that are specific to that team (the schemes)....
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