Como configurar um item do jira para que somente o relator e o responsável possam ter acesso ao item
You can do that with security level/ security scheme
https://support.atlassian.com/jira-cloud-administration/docs/configure-issue-security-schemes/
This will allow you to set a level based on assignee, reporter, for example.
A security level's members may consist of:
Individual users
Groups
Project roles
Work item roles such as 'Reporter', 'Project Lead', and 'Current Assignee'
'Anyone' (eg. to allow anonymous access)
A (multi-)user or (multi-)group picker custom field.
Regards
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