JIRA doesn't support field level security. You might want to check out this plugin to see if it helps: https://marketplace.atlassian.com/plugins/com.quisapps.jira.jfs
another way is, remove the Label field from edit screen and add WFA as something like "Update Labels" and ladd labels to that transition screen so you can restrict to do that transition to specific project role by using condition.
we had the same requirement, we did as above.
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