This is indeed not possible in the current version unless all users are an agent with access to the ticket's type, or all users are added as a CC user (which we don't advise for many users). You could instead make a knowledge base article by clicking on the
Actions button on a ticket, then select
Make knowledgebase article. Or you could add news on the
Configuration -> News Page, which will be visible for all users who have access to the website.