i'd like to know whether it is possible to share my backlog with other people in my company (read-only of course) without creating JIRA accounts for them via certain add-on or API?
If they don't have accounts, then the only option is to grant anonymous access, which will let everyone see it.
Check the permission schemes for the projects you want to make visible and add the group called anyone to browse project.
As you've already suggested, I'd advise using this only for browse project and nothing else at all (well, ok, view workflow maybe)
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