Please tell me if it is possible to make the user have full access to a certain board, that is, so that he can add new project roles to the project without the help of an administrator through general settings - > security -> (roles in the project), but do not have access to other projects i.e. be a limited jira admin, but only for his project?
It sounds like the user just needs to be in the Administrator project role for that specific project.
I am not sure if I understood your question correctly.
Briefly, you can provide Administrators role on per project-basis. As a project administrator, you have the ability to edit project role memberships, project versions and certain project details (project name, description, lead and URL). No need to give jira-admin rights.
Board administrator is a different thing.
Please check this page, it compares permissions: How do Jira permissions work?
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