Not by default. An option is to use a multi user custom field and use that to populate the users. You will have to then use the same field in permissions, notifications etc just like the assignee field is used.
One thing you will miss out is the option to use "Assign" operation to set that field.
Hello, Community! My name is Gosia and I'm a Product Manager on Jira Server and Data Center here at Atlassian. Since 2002 when we launched our public issue tracker, jira.atlass...
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