The three feature flagging platforms listed at that page are actually available as Apps on the Atlassian Marketplace. There is no special trick to integrate a feature flag platform compared to any other integration / app.
If you do not wish to learn how to do this yourself, you can also try to partner up with existing vendors to see if they are interested in creating the integration.
Shameless plug: my team would be available to help if you want to partner up
Before you start reading that documentation it would be a good idea to get a general idea on how to build Jira Cloud App’s. The documentation will be more readable then.
Hi @BenRometsch , is this still something that Bullet train / Flagsmith is working on? We are bullet train customers and were trying to find better ways to identify which features were flagged off when we released them.