Starting from version 7.0, TFS4JIRA supports links synchronization between JIRA and TFS/VSTS. It allows users to map link relation such as parent/child, relates to/related to, custom links, etc. The following would be the steps for links mapping,
Links mapping can be enabled and set in field mapping screen in the sync profile.
Select one Jira Link Type and the corresponding TFS Link Type, and then click Map.