Hi Nikolas,
Welcome on Community!
Boards are managed individually which means that you can totally grant access to a single board in a project holding many of them! If your board is based on a filter, the people/groups/etc to which the filter is shared will be granted access to the board.
A lot more about boards administration: https://confluence.atlassian.com/jirasoftwarecloud/configuring-a-board-764477974.html#Configuringaboard-Sharingaboard
Hope this helps!
Cheers
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