Hi Arnold - Welcome to the Atlassian Community!
Unfortunately, you can only choose the Project Default or Project Lead role for the default assignee to a Component. You cannot use other Project Roles.
@Arnold Chang
And what is component lead? can you give brief information?
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@Arnold Chang
You can set user or group to project role with following steps:
Projects -> "Project_Name"->User and Roles -> then Add users to a role:
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