A board will not display or count issues that the viewer cannot see. So you just create a board, and let JIRA handle it based on who is logged in and looking at it.
Or do you mean that you want the board to display issues that a user cannot normally see? That would be a security issue, and hence never going to happen - you'll need to allow your users to see the issues you want them to work with.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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