You don't. The assignee is the one single person responsible for an issue, and it should stay that way (because multiple assignees simply does not work in real life. It has to be a single person with ultimate responsibility)
See https://confluence.atlassian.com/display/JIRA/How+do+I+assign+issues+to+multiple+users for the ways to indicate group involvement
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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