OSGI bundle export

Hi everyone,

I am developing a plugin for Bitbucket DC 9.6. My question is, if a bundle exports a package (in my case the System Bundle and Atlassian - Spring 5.3.39-atlassian-4 bundle), can that package be imported by the plugin? I also read about platform-public-api… Are only those packages/artifacts available to plugins that are registered there?

Thanks in advance for the clarification