Grant permission by field and not by project

[Luciana Góes]

Can I give edit permission to a specific field? Or will it always be by design? It would be for a custom field.

[Gor Greyan]

Hi @Luciana Góes

Welcome to the Community!
Short answer: No — Jira Cloud does not support true field-level edit permissions out of the box.

However, you can approximate that behaviour using workflow tricks/transition screens/conditions. Atlassian’s docs even describe this workaround.
Check the following doc. 
https://support.atlassian.com/jira/kb/how-to-restrict-field-editing-to-specific-users-in-jira-cloud/?utm_source=chatgpt.com

Also, you can read the following community question.
https://community.atlassian.com/forums/Jira-Service-Management/Custom-fields-edit-permissions/qaq-p/1910850?utm_source=chatgpt.com