Have you taken a look at the "Link XML" section of https://docs.unity3d.com/Manual/ManagedCodeStripping.html ? If you still need help please elaborate on what issue you are having. For example, what have you tried adding to the link xml file? Do your additions appear to not do anything? Do your additions cause the build to fail due to a crash in UnityLinker?
I'm trying to migrate a project into the new addressables system. And I'm having issues with stripping in general. I try using the link file, but the additions don't seem to do anything. What seems to work is having a scene build in Player with an object with references to the classes I'm gone bee using. But even that doesn't work with all things. I'm struggling especially with StateMachineBehaviour , can't manage to make it work. keep getting null reference exception errors.
I suppose you need to add particularly an assembly name to link.xml, which you can find in asmdef file. For example, Cinemachine's assembly name is simply Cinemachine, not Unity.Cinemachine or UnityEngine.Cinemachine. There could be a similar issue here https://forum.unity.com/threads/asset-bundles-and-timeline-ios.586018/