To view issues in a project is a project level setting. If you only want to restrict this to certain issues in the project, then you will need to setup an issue level security inside that project, which says which which users/roles/groups can access particular issues. However, please note that issue level security is not available in team managed projects, therefore you will need to use a company managed projects. For more information on issue security: https://support.atlassian.com/jira-cloud-administration/docs/configure-issue-security-schemes/
An alternative way would be to use the Jira Service Management (JSM) product instead. In this, reporters will raise issues through a support portal. Therefore, depending on the configuration, they will only be able to view tickets raised by them. For more information on JSM: https://www.atlassian.com/software/jira/service-management?tab=employee-support
Hope that helps.
Team Managed projects do offer a form of issue security, but the implementation is different than what is available in Company Managed projects. For more information refer to
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