No. Jira only allows one assignee at a time.
I understand why - where systems do allow for multiple assignees, you often find everyone says "not my problem, one of the others should be handling it" and nothing gets done, but equally, multiple assignees is very useful.
I usually work around it by using one (or both, or variations on):
Hey everyone! My name is Sarah Schuster, and I'm a Customer Success Manager in Atlassian specializing in Jira Software Cloud. Over the next few weeks I will be posting discussion topics (8 total) to ...
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