This article explains how to set field value for issues in bulk using Jira Command Line Interface (CLI) in Jira.
Form a JQL query to find the target issue where field value needs to be added. Please refer below sample JQL for reference:
project = ABC AND issuetype = Bug
Combine runFromIssueList and setFieldValue to set the field value for the target issues. This example works because runFromIssueList have --jql parameters and setFieldValue have --issue, --field and --value parameters.
--action runFromIssueList --jql "project = ABC AND issuetype = Bug" --common "--action setFieldValue --issue @issue@ --field "App" --value "CLI""
Additionally the --suppressNotify parameter can be used, to suppress the notifications for users.
It is recommended to test this scenario in a non-production environment or run the action with the --simulate parameter, to verify the behavior before implementing it in production.