For local Jira(Server edition) it was such possibility, configuring Announcement Banner.
I can’t find some similar solution for Jira Cloud.
Here you go: https://confluence.atlassian.com/display/Cloud/Configuring+an+Announcement+Banner
I am sorry, for misunderstanding. I am developing add-on, which communicates with Jira through REST. And in your answer have place only static information, and i can't configure such banner through REST, it is commonly used by jira admins, so it will not work in my case. Thanks, for answer.
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