If you don't want to use Issue security to restrict users to see tickets and also don't want all your users to see all tickets available in Jira, this article will help you achieve this.
By simply adding a user picker custom field in the permission "Browse Project" you can choose the ticket and the user that you want to share with.
1 - Create a custom field with the type "User Picker (multiple users)" and add to the project screen.
2 - Go to the Project settings > Permission and add the custom field on Browse projects > User custom field value > Grant.
3 - Go to the ticket that you want to share with this user and click on Admin > Add field.
4 - After clicking on Edit field, on the next screen, you will type the users' name and Submit.
Hope this helps!
If you have questions or feedback, please let us know.
Angélica LuzAtlassian Team
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