We need a filter to return issues that do not have a certain issue type linked as related. Right now, we are achieving this with the ScriptRunner Enhanced Search Jira add-on app, but we would love to be able to do this with the default search so we don't need the add-on.
Example JQL code from the ScriptRunner app:
issueFunction not in linkedIssuesOf(type = "Issue Type A", "relates to")